[sr-dev] [kamailio/kamailio] tls.reload during TLS relaying in sipp test will cause memory coruption of tls module (Issue #3305)

[JiangHai2011]

### Description
during sipp "tls caller and tls callee" test,  do tls.reload repeatedly,   the sipp tls connection will be disconnected and tls.reload will report error and can not be recovered

### Troubleshooting

#### Reproduction
(1)write a simple request_route logic in kamailio.cfg, as follows:
request_route {
	add_local_rport();
	$du = "sip:192.168.131.190:1001;transport=tls";
	forward();
}
(2)start sipp caller to kamailio tls:0.0.0.0:5061 and kamailio will relay this request to callee
(3)at the same time, in another console, run the following cmds:
((i = 0)); while true; do /opt/kamailio/sbin/kamcmd tls.reload && echo $i && ((i = i+1)); done;

#### Debugging Data
None

#### Log Messages
tls.reload will report the following error, and it can not work again until kamailio is restarted:
error: 500 - Error while loading TLS configuration file (consult server log)

at the same time, sipp tls connection is disconnected by kamailio, some error is shown in the kamailo.log:
--------------------------------------------------------------------------------------------------------
Dec 14 10:59:54 localhost sipproxy[64723]: ERROR: tls [tls_server.c:1330]: tls_h_read_f(): protocol level error
Dec 14 10:59:54 localhost sipproxy[64723]: ERROR: tls [tls_server.c:1334]: tls_h_read_f(): src addr: 192.168.131.190:59545
Dec 14 10:59:54 localhost sipproxy[64723]: ERROR: tls [tls_server.c:1337]: tls_h_read_f(): dst addr: 192.168.131.190:5061
Dec 14 10:59:54 localhost sipproxy[64723]: ERROR: <core> [core/tcp_read.c:1478]: tcp_read_req(): ERROR: tcp_read_req: error reading - c: 0x7f3f67c89ba8 r: 0x7f3f67c89cd0 (-1)
--------------------------------------------------------------------------------------------------------
#### SIP Traffic

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If the issue is exposed by processing specific SIP messages, grab them with ngrep or save in a pcap file, then add them next, or attach to issue, or provide a link to download them (e.g., to a pastebin site).
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```
```

### Possible Solutions

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### Additional Information

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

```
version: kamailio 5.6.2 (x86_64/linux) 
flags: USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MMAP, PKG_MALLOC, Q_MALLOC, F_MALLOC, TLSF_MALLOC, DBG_SR_MEMORY, USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CACHE, USE_DNS_FAILOVER, USE_NAPTR, USE_DST_BLOCKLIST, HAVE_RESOLV_RES
ADAPTIVE_WAIT_LOOPS 1024, MAX_RECV_BUFFER_SIZE 262144, MAX_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB
poll method support: poll, epoll_lt, epoll_et, sigio_rt, select.
id: unknown 
compiled on 10:03:56 Dec 14 2022 with gcc 4.9.4
```

* **Operating System**:

<!--
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Kernel details (output of `lsb_release -a` and `uname -a`)
-->

```
Linux localhost.localdomain 3.10.0-327.el7.x86_64 #1 SMP Thu Nov 19 22:10:57 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
```


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