s3:libsmb/namequery.c: add saf_join_store() function

s3:libsmb/namequery.c: add saf_join_store() function

saf_join_store() should be called after a successful
domain join, the affinity to the dc used at join time
has a larger ttl, to avoid problems with delayed replication.

metze

Signed-off-by: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Günther Deschner <gd@samba.org>
(cherry picked from commit 80e74a27c55c01221091e3eec930c2ac4433c22c)
(cherry picked from commit 895c40d03a07182c054a6fd857e7dd6838e698f4)
(cherry picked from commit 7b56268b3c9652e3089bd75e4e51dd626fa742a6)