Updated openstack/openstack
Project: openstack/tempest  14b75e861fd7d18aa2f5365e4553393cba93cb3a
null
add negative test cases for create snapshots:

- test_create_snapshot_with_nonexistent_volume_id
- test_create_snapshot_without_passing_volume_id

Change-Id: I3e105b51a96566e714adc655394f1ff9b2748cb5