s3:smbd remove unused code

s3:smbd remove unused code

in the early CTDB days, the RELEASE_IP message was defined
and some code was added to react on such a message to make
smbd exit if the IP address it was using for the server socket
is removed by CTDB.
Later, it was discovered that we need to stop smbd immediately
and logic was added to ctdb_conn to call release_ip() without
going through the messaging system.

So this code is not used and can be removed

Autobuild-User: Christian Ambach <ambi@samba.org>
Autobuild-Date: Fri May 20 16:18:24 CEST 2011 on sn-devel-104