Updated openstack/openstack
Project: openstack/nova  79ab8572a9ab681bef969c8bb2c8e6d49ed8dbc1

Lock attach_volume

There are some issues with instance and volume cleanup when the volume
is not in a fully attached state so it will be safer to not attempt a
terminate_instance while there are attachments in progress.

Change-Id: I4347794e51004a881bf4ef5ee30f65ac28773e51
Closes-Bug: #1355348