Updated openstack/openstack
Project: openstack/cinder  3d856228152c24ac5585ad6a24ad5629bd9c2fc8

Catch ImageNotFound exception when deleting rbd volume

When deleting a rbd volume it is possible for remove() to
throw a ImageNotFound exception. In this case we should
catch the exception, so the volume delete can continue.

Closes-Bug: 1403172
Change-Id: I32cf9d3774c129cda4449996ceeb4b43b7e42904