Updated openstack/openstack
Project: openstack/glance  35bf0af69cc128f7878339c9904f9af487e8df8c
null
Fix inconsistent doc string and code of db_sync

db_sync may downgrade but current doc string only says
upgrade, and it says having return value which seems not
true.

Change-Id: Ib7bbb597f621985aba956302034eb1c5d0b3ff1f
Closes-Bug: #1264193