[sr-dev] [kamailio/kamailio] /var/run/kamailio/ owned by root after Kamailio start (#2334)

[arkadiam]

Environment:
```
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=16.04
DISTRIB_CODENAME=xenial
DISTRIB_DESCRIPTION="Ubuntu 16.04.6 LTS"
```

Kamailio installed from:

```
/etc/apt/sources.list
deb     http://deb.kamailio.org/kamailio53 xenial main
deb-src http://deb.kamailio.org/kamailio53 xenial main
```

After Kamailio start, ownership of `/var/run/kamailio/` and related files looks like:

```
# ls -l  /var/run/kamailio/
total 4
srw-rw---- 1 kamailio kamailio 0 May 20 15:41 kamailio_ctl
-rw-r--r-- 1 kamailio kamailio 5 May 20 15:41 kamailio.pid
prw-rw---- 1 root     root     0 May 20 15:41 kamailio_rpc.fifo
srw-rw---- 1 root     root     0 May 20 15:41 kamailio_rpc.sock
# ls -ld  /var/run/kamailio/
drwxr-x--- 2 root root 120 May 20 15:41 /var/run/kamailio/
```

Note 'root' ownership.
This causes these errors during Kamailio stop and probabaly some other issues too.
```
May 20 16:11:24 sip01 /usr/sbin/kamailio[5919]: ERROR: jsonrpcs [jsonrpcs_fifo.c:599]: jsonrpc_fifo_destroy(): FIFO stat failed: Permission denied
May 20 16:11:24 sip01 /usr/sbin/kamailio[5919]: ERROR: jsonrpcs [jsonrpcs_sock.c:516]: jsonrpc_dgram_destroy(): socket stat failed: Permission denied
May 20 16:11:24 sip01 /usr/sbin/kamailio[5919]: ERROR: ctl [ctl.c:390]: mod_destroy(): ERROR: ctl: could not delete unix socket /var/run/kamailio//kamailio_ctl: Permission denied (13)
```


To get the ownership right I have to modify `/lib/systemd/system/kamailio.service`
and add:
```
User=kamailio
Group=kamailio
```

Now ownership after start looks like bellow and stops are clean too.
```
# ls -l  /var/run/kamailio/
total 4
srw-rw---- 1 kamailio kamailio 0 May 20 15:52 kamailio_ctl
-rw-r--r-- 1 kamailio kamailio 5 May 20 15:52 kamailio.pid
prw-rw---- 1 kamailio kamailio 0 May 20 15:52 kamailio_rpc.fifo
srw-rw---- 1 kamailio kamailio 0 May 20 15:52 kamailio_rpc.sock
# ls -ld  /var/run/kamailio/
drwxr-x--- 2 kamailio kamailio 120 May 20 15:52 /var/run/kamailio/
```


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