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### Description

Resetting an htable from kemi causes a segfault.

```python KSR.htable.sht_reset(self._htable) ```

### Troubleshooting

#### Reproduction

<!-- If the issue can be reproduced, describe how it can be done. -->

#### Debugging Data

``` #0 0x00007f466dad1c06 in core_case_hash (s1=0x7f4672556ec8, s2=0x0, size=0) at ../../core/hashes.h:317 #1 0x00007f466dad3731 in ht_get_table (name=0x7f4672556ec8) at ht_api.c:240 #2 0x00007f466daeabf4 in ht_reset_by_name (hname=0x7f4672556ec8) at htable.c:669 #3 0x00007f466ed83515 in sr_apy_kemi_exec_func_ex (ket=0x7f466dd0f730 <sr_kemi_htable_exports+144>, self=0x0, args=0x7f4673504b10, idx=303) at apy_kemi.c:438 #4 0x00007f466ed87633 in sr_apy_kemi_exec_func (self=0x0, args=0x7f4673504b10, idx=303) at apy_kemi.c:692 #5 0x00007f466ed706ad in sr_apy_kemi_exec_func_303 (self=0x0, args=0x7f4673504b10) at apy_kemi_export.c:2467 #6 0x00007f466e854091 in PyEval_EvalFrameEx () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0 #7 0x00007f466e852390 in PyEval_EvalFrameEx () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0 #8 0x00007f466e852390 in PyEval_EvalFrameEx () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0 #9 0x00007f466e852390 in PyEval_EvalFrameEx () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0 #10 0x00007f466e852390 in PyEval_EvalFrameEx () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0 #11 0x00007f466e9bb29c in PyEval_EvalCodeEx () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0 #12 0x00007f466e90f76d in ?? () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0 #13 0x00007f466e8a75c3 in PyObject_Call () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0 #14 0x00007f466e84f247 in PyEval_EvalFrameEx () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0 #15 0x00007f466e9bb29c in PyEval_EvalCodeEx () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0 #16 0x00007f466e90f670 in ?? () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0 #17 0x00007f466e8a75c3 in PyObject_Call () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0 #18 0x00007f466e964dfc in ?? () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0 #19 0x00007f466e8a75c3 in PyObject_Call () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0 #20 0x00007f466e9ba6c7 in PyEval_CallObjectWithKeywords () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0 #21 0x00007f466eda041f in apy_exec (_msg=0x7f4672556ec8, fname=0x560e4d8eadf8 "ksr_reply_route", fparam=0x0, emode=0) at python_exec.c:145 #22 0x00007f466ed781ae in sr_kemi_config_engine_python (msg=0x7f4672556ec8, rtype=128, rname=0x0, rparam=0x0) at apy_kemi.c:67 #23 0x0000560e4d5fb64c in sr_kemi_route (keng=0x560e4dbdcf60 <_sr_kemi_eng_list>, msg=0x7f4672556ec8, rtype=128, ename=0x0, edata=0x0) at core/kemi.c:2421 #24 0x0000560e4d6d7c57 in receive_msg (buf=0x560e4ed34d30 "SIP/2.0 200 OK\r\nRecord-Route: sip:sipcore;transport=tcp;lr;nat=yes\r\nVia: SIP/2.0/TCP 172.16.214.19:5060;rport=41056;received=172.28.1.4;branch=z9hG4bK4c66.ff59d957", '0' <repeats 24 times>, ".0\r\nTo: <si"..., len=515, rcv_info=0x7f46694cc418) at core/receive.c:408 #25 0x0000560e4d776eb5 in receive_tcp_msg ( tcpbuf=0x7f46694cc6f8 "SIP/2.0 200 OK\r\nRecord-Route: sip:sipcore;transport=tcp;lr;nat=yes\r\nVia: SIP/2.0/TCP 172.16.214.19:5060;rport=41056;received=172.28.1.4;branch=z9hG4bK4c66.ff59d957", '0' <repeats 24 times>, ".0\r\nTo: <si"..., len=515, rcv_info=0x7f46694cc418, con=0x7f46694cc400) at core/tcp_read.c:1448 #26 0x0000560e4d779192 in tcp_read_req (con=0x7f46694cc400, bytes_read=0x7fff72893524, read_flags=0x7fff7289352c) at core/tcp_read.c:1631 #27 0x0000560e4d77cdb9 in handle_io (fm=0x7f4672544500, events=1, idx=-1) at core/tcp_read.c:1862 #28 0x0000560e4d7696ad in io_wait_loop_epoll (h=0x560e4dc371a0 <io_w>, t=2, repeat=0) at core/io_wait.h:1065 #29 0x0000560e4d77e18f in tcp_receive_loop (unix_sock=22) at core/tcp_read.c:1974 #30 0x0000560e4d6503b3 in tcp_init_children () at core/tcp_main.c:4853 #31 0x0000560e4d54a86d in main_loop () at main.c:1745 #32 0x0000560e4d55199d in main (argc=5, argv=0x7fff72893bc8) at main.c:2696

```

``` (gdb) frame #2 0x00007f466daeabf4 in ht_reset_by_name (hname=0x7f4672556ec8) at htable.c:669 669 ht = ht_get_table(hname); (gdb) list 664 } 665 666 static int ht_reset_by_name(str *hname) 667 { 668 ht_t *ht; 669 ht = ht_get_table(hname); 670 if(ht==NULL) { 671 LM_ERR("cannot get hash table [%.*s]\n", hname->len, hname->s); 672 return -1; 673 } (gdb) p hname hname hname_data hname_fixup (gdb) p hname. len s (gdb) p hname.len $10 = 1556597679 (gdb) p hname.s $11 = 0x720000000c <error: Cannot access memory at address 0x720000000c> ```

#### Log Messages

<!-- Check the syslog file and if there are relevant log messages printed by Kamailio, add them next, or attach to issue, or provide a link to download them (e.g., to a pastebin site). -->

``` May 1 10:18:56 ws3171 lmrncf[1893]: 0(1) INFO: <core> [main.c:772]: handle_sigs(): SIGCHLD received, but no child has stopped, ignoring it May 1 10:18:56 ws3171 lmrncf[1893]: 6(110) INFO: ctl [io_listener.c:214]: io_listen_loop(): io_listen_loop: using epoll_lt io watch method (config) May 1 10:18:59 ws3171 lmrncf[1893]: 7(111) INFO: [Media] Media connected to ('172.28.1.8', 53350) May 1 10:19:03 ws3171 lmrncf[1893]: 10(114) INFO: {1 1 REGISTER MLqF3GJQD6ZcDgNvd4clLg..} [LMR] Registered gateway IP: 172.16.195.127 May 1 10:19:03 ws3171 lmrncf[1893]: 10(114) INFO: {1 1 REGISTER MLqF3GJQD6ZcDgNvd4clLg..} <core> [core/tcp_main.c:2703]: tcpconn_1st_send(): quick connect for 0x7f2bf92a59e0 May 1 10:19:03 ws3171 lmrncf[1893]: 11(115) ERROR: {2 10 SUBSCRIBE 358eceb71627d8e0-114@172.28.1.4} [PoC] Subscribe failed with code 404 May 1 10:19:03 ws3171 lmrncf[1893]: 11(115) ERROR: {2 10 SUBSCRIBE 358eceb71627d8e0-114@172.28.1.4} crumb 1 May 1 10:19:03 ws3171 lmrncf[1893]: 11(115) ERROR: {2 10 SUBSCRIBE 358eceb71627d8e0-114@172.28.1.4} crumb -- hmmm here goes reset -- affiliation_groups May 1 10:19:03 ws3171 lmrncf[1893]: 12(116) CRITICAL: <core> [core/pass_fd.c:277]: receive_fd(): EOF on 20 May 1 10:19:03 ws3171 lmrncf[1893]: 0(1) ALERT: <core> [main.c:755]: handle_sigs(): child process 115 exited by a signal 11 May 1 10:19:03 ws3171 lmrncf[1893]: 0(1) ALERT: <core> [main.c:758]: handle_sigs(): core was generated May 1 10:19:03 ws3171 lmrncf[1893]: 0(1) INFO: <core> [main.c:781]: handle_sigs(): terminating due to SIGCHLD

```

### Possible Solutions

<!-- If you found a solution or workaround for the issue, describe it. Ideally, provide a pull request with a fix. -->

It appears that because the kemi htable jump-table references `ht_reset_by_name` (without `ki_` prefix) for `sht_reset` it will be called with `msg` as first argument but `ht_reset_by_name` doesn't accept msg context at all -- its only argument is the name of the htable of interest.

```c++ static sr_kemi_t sr_kemi_htable_exports[] = { { str_init("htable"), str_init("sht_lock"), SR_KEMIP_INT, ki_ht_slot_lock, { SR_KEMIP_STR, SR_KEMIP_STR, SR_KEMIP_NONE, SR_KEMIP_NONE, SR_KEMIP_NONE, SR_KEMIP_NONE } }, { str_init("htable"), str_init("sht_unlock"), SR_KEMIP_INT, ki_ht_slot_unlock, { SR_KEMIP_STR, SR_KEMIP_STR, SR_KEMIP_NONE, SR_KEMIP_NONE, SR_KEMIP_NONE, SR_KEMIP_NONE } }, { str_init("htable"), str_init("sht_reset"), SR_KEMIP_INT, ht_reset_by_name, { SR_KEMIP_STR, SR_KEMIP_NONE, SR_KEMIP_NONE, SR_KEMIP_NONE, SR_KEMIP_NONE, SR_KEMIP_NONE } }, { str_init("htable"), str_init("sht_iterator_start"), SR_KEMIP_INT, ki_ht_iterator_start, { SR_KEMIP_STR, SR_KEMIP_STR, SR_KEMIP_NONE, SR_KEMIP_NONE, SR_KEMIP_NONE, SR_KEMIP_NONE } }, { str_init("htable"), str_init("sht_iterator_next"), SR_KEMIP_INT, ki_ht_iterator_next, ```

```c++ static int ht_reset_by_name(str *hname); ```

### Additional Information

* **Kamailio Version** - output of `kamailio -v`

``` kamcmd 1.5 Copyright 2006 iptelorg GmbH This is free software with ABSOLUTELY NO WARRANTY. For details type `warranty'. kamcmd> ver kamailio 5.2.2 (x86_64/linux) kamcmd> ```

* **Operating System**:

<!-- Details about the operating system, the type: Linux (e.g.,: Debian 8.4, Ubuntu 16.04, CentOS 7.1, ...), MacOS, xBSD, Solaris, ...; Kernel details (output of `uname -a`) -->

``` Linux b8af694f9887 4.15.0-47-generic #50-Ubuntu SMP Wed Mar 13 10:44:52 UTC 2019 x86_64 GNU/Linux ```