ctdb-scripts: Drop use of "smbcontrol winbindd ip-dropped ..."

ctdb-scripts: Drop use of "smbcontrol winbindd ip-dropped ..."

This is unnecessary in Samba >= 4.0 because winbindd monitors IP
address itself and no longer needs to be told when they are dropped.
The smbcontrol commands can hang if a node has recovery mode active
because smbcontrol is unable to connect to the registry.  Therefore,
the smbcontrol commands should be removed.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=11719

Signed-off-by: Martin Schwenke <martin@meltin.net>
Reviewed-by: Ralph Boehme <slow@samba.org>
Autobuild-User(master): Ralph Böhme <slow@samba.org>
Autobuild-Date(master): Wed Feb 10 14:08:17 CET 2016 on sn-devel-144