[SR-Users] unregister user when kamailio looses TCP connection.

[Vitaliy Aleksandrov]

> Make the patch for master branch, 4.0 doesn't take any new feature and 
> I applied the patches to master branch anyhow.
>
> Also, do not forget the patch for xml documentation.
>
> Cheers,
> Daniel
Patch for master branch is in the attachment.

Changelog:
- documentation is updated
- tcpconn_id initialized to "-1" for contacts loaded from a database 
during startup (Write-Back & Write-Through database modes).
- tcpconn_id is being updated when UA reconnects and refreshes its 
registration.
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