TLS uses remote IP address instead of hostname when sending BYE

[nanangizz]

This is an attempt to fix issue #2706.

The issue seems to occur only when the transport used in dialog creation is a server socket, where remote address is an IP address not a hostname, so the dlg->initial_dest will be an IP address. Note that the dlg->initial_dest is currently used only for initializing tdata->dest_info.name which eventually used for verifying remote TLS certificate.

The idea here is to only set the dlg->initial_dest from transport info when the transport is a client socket, which TLS verification is usually performed. When it is a server socket, the tdata->dest_info.name will be initialized from request URI or route header (later by pjsip_endpt_send_request_stateless() or pjsip_endpt_send_response().