CVE-2014-8143:dsdb: Allow use of dsdb_autotransaction_request outside util.c

Bug: https://bugzilla.samba.org/show_bug.cgi?id=10993

Change-Id: If6bc90305a1e9a5a92562a01ba7e44330de91cc1
Pair-programmed-with: Garming Sam <garming@catalyst.net.nz>
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Signed-off-by: Garming Sam <garming@catalyst.net.nz>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
