Revert "s3:messages: allow messaging_{dgm,ctdb}_register_tevent_context() to use...

Revert "s3:messages: allow messaging_{dgm,ctdb}_register_tevent_context() to use wrapper tevent_context"

This reverts commit 660cf86639753edaa7a7a21a5b5ae207ae7d4260.

See the discussion in

https://lists.samba.org/archive/samba-technical/2018-December/131731.html

for the reasoning behind this revert.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=14033

Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
(cherry picked from commit 1c3676f3aa9c1564eb140a24ced5ee72b859b87f)