s3: locking: Update oplock optimization for the leases era !

s3: locking: Update oplock optimization for the leases era !

BUG: https://bugzilla.samba.org/show_bug.cgi?id=12628

Signed-off-by: Jeremy Allison <jra@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
Autobuild-User(master): Ralph Böhme <slow@samba.org>
Autobuild-Date(master): Wed Mar 15 20:04:32 CET 2017 on sn-devel-144

(cherry picked from commit 1c4b15aa5f6707e7bcfc21435e26929fb7f45c0f)

Autobuild-User(v4-4-test): Karolin Seeger <kseeger@samba.org>
Autobuild-Date(v4-4-test): Fri Mar 24 12:35:06 CET 2017 on sn-devel-144