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

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>
(Imported from commit 519564bb35a0f840bc4d7c8c5a92441c97b49791)