[sr-dev] [kamailio/kamailio] WebSocket Module memory leak (Issue #3236)

[iliesh]

### Description

By using the WebSocket module we noticed that the memory on the server keeps increasing daily even if the number of registered devices is decreasing

### Troubleshooting

#### Reproduction

Connect to the server through the wss and then disable the network adapter.

#### Debugging Data

If the TCP connection is closed forcefully (tested by disabling network adapter) then the number of current wss connections is not decreasing:

```
kamcmd stats.get_statistics all | grep "ws_current_connections"
```
The same happens with the allocated shared memory:
```
kamcmd mod.stats all shm | grep 'wsconn_'
```
wsconn_add(198) - this value is not decreasing.
Everything is working properly if the TCP connection is properly closed.

* **Operating System**:

```
CentOS 7 X64
3.10.0-1160.76.1.el7.x86_64
version: kamailio 5.6.1 (x86_64/linux) d8f98b
```
XHTTP Request Route:

```
event_route[xhttp:request] {
  set_reply_close();
  set_reply_no_connect();

   if (ws_handle_handshake()) {
    xlog("L_INFO", "[$cfg(route)] websocket|log|handled HTTP request $rm from $si:$sp\n");
    exit;
  }
}
```

TCP Settings:
```
tcp_connection_lifetime=3605
tcp_accept_no_cl=yes
tcp_rd_buf_size=16384
tcp_connect_timeout=10
tcp_crlf_ping=yes
tcp_delayed_ack = yes
tcp_fd_cache = yes
tcp_keepalive = yes
tcp_keepcnt = 3
tcp_keepidle = 30
tcp_keepintvl = 10
tcp_accept_aliases=no
tcp_async=yes
tcp_linger2=30
tcp_max_connections=4096
tcp_send_timeout = 10
```

-- 
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https://github.com/kamailio/kamailio/issues/3236
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