[sr-dev] [kamailio/kamailio] [kamailio 5.2.5] Wrong send socket on a multi homed proxy (#2181)

[vitalikvoip]

### Description
Kamailio fails to forward in-dialog request over TCP/TLS/WS/WSS connection.

### Troubleshooting

kamailio 5.2 branch has a commit 
09ac3e47ef79dbd599b7dec5b84ae3b792f025ed cherry picked from master branch.
It makes sense for master because get_send_socket2() behavior has 
changed and function became smarter and also there were some patches to 
propagate connection it to the uac structure.

After applying this patch to 5.2.x kamailio searches for an outgoing socket, receives the first one due to limitations of get_send_socket2() and SND_F_FORCE_SOCKET flag. Then it fails to find an existing TCP connection by destination ip:port since it searches for a connection associated with a wrong socket.

#### Log Messages

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```

Dec 11 21:33:49  kamailio[17999]: WARNING: <core> [core/msg_translator.c:2832]: via_builder(): TCP/TLS connection (id: 0) for WebSocket could not be found
Dec 11 21:33:49  kamailio[17999]: ERROR: tm [t_msgbuilder.c:1372]: assemble_via(): via building failed
Dec 11 21:33:49  kamailio[17999]: ERROR: tm [t_msgbuilder.c:1540]: build_uac_req(): error while assembling Via
Dec 11 21:33:49  kamailio[17999]: ERROR: tm [uac.c:517]: t_uac_prepare(): Error while building message
Dec 11 21:33:49  kamailio[17999]: ERROR: presence [notify.c:1798]: send_notify_request(): in function tmb.t_request_within
Dec 11 21:33:49  kamailio[17999]: ERROR: presence [notify.c:1897]: notify(): sending Notify not successful
Dec 11 21:33:49  kamailio[17999]: ERROR: presence [notify.c:1491]: publ_notify(): Could not send notify for message-summary
```


### Possible Solutions

Delete mentioned commit from the 5.2 branch.
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If you found a solution or workaround for the issue, describe it. Ideally, provide a pull request with a fix.
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### Additional Information

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

```
5.2.5
```

* **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
```


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