[sr-dev] [kamailio/kamailio] Unable to change tls connection_timeout via kamcmd (#1639)

[arkadiam]

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### Description
Following tls module documentation I'm trying to change connection_timeout value:

```
# kamcmd cfg.set_now_int tls connection_timeout 300
error: 400 - Failed to set the variable
```

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Explain what you did, what you expected to happen, and what actually happened.
-->

### Troubleshooting

#### Log Messages

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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).
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```
Sep 11 10:07:32 sip02 /usr/sbin/kamailio[32408]: DEBUG: ctl [io_listener.c:442]: handle_new_connect(): handle_stream read: new connection (1) on /var/run/kamailio//kamailio_ctl
Sep 11 10:07:32 sip02 /usr/sbin/kamailio[32408]: ERROR: <core> [core/cfg/cfg_ctx.c:386]: cfg_set_now(): ERROR: cfg_set_now(): integer value is out of range
Sep 11 10:07:32 sip02 /usr/sbin/kamailio[32408]: ERROR: <core> [core/cfg/cfg_ctx.c:653]: cfg_set_now(): ERROR: cfg_set_now(): failed to set the variable: tls.connection_timeout
Sep 11 10:07:32 sip02 /usr/sbin/kamailio[32408]: DEBUG: ctl [io_listener.c:495]: handle_stream_read(): handle_stream read: eof on /var/run/kamailio//kamailio_ctl
```

### Possible Solutions
Workaround: restart kamailio instead of trying to change variable of the running instance.
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### Additional Information

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

```
version: kamailio 5.0.7 (x86_64/linux)                                                                                                                                                     
flags: STATS: Off, USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MEM, 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_BLACKLIST, HAVE_RESOLV_RES
ADAPTIVE_WAIT_LOOPS=1024, MAX_RECV_BUFFER_SIZE 262144, MAX_LISTEN 16, 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 with gcc 5.3.1
```

* **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 sip02 4.4.0-134-generic #160-Ubuntu SMP Wed Aug 15 14:58:00 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
```


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