Updated openstack/openstack
Project: openstack/nova  65d941bf5b773ccafce93759b4737db82b4a1607

Make DriverBlockDevice save() context arg optional

We do not need to pass it explicitly since we wrap
BlockDeviceMapping object, which hold their own context.

Also remove an ugly use of get_admin_context() to get around the
limitation that existed previously.

Change-Id: Ide4d2e4e3fd1b456dec9e71939b63e913849c6cf