Updated openstack/openstack
Project: openstack/nova  74d5945e042dba486064a55048c05369bedf4501

add comment about why snapshot/backup have no lock check

This comment is intended to reduce further confusion about why a
lock check hasn't been implemented for snapshot and backup.

Change-Id: I8d89ca7b15d6713221af2d0535f9ed338ca70612
Related-Bug: #1314741