The property "signature_verified" is added by cinder
to volumes created from images. That property is
propagated to glance when images are created from such
volumes. Later, when creating volumes from such images
again, the image property conflicts with cinder trying to
add the property again. The solution is to never
propagate such cinder property in the first place.
Closes-bug: #1823445
Change-Id: Id46877e490b17c00ba1cf8cf312dd2f456760a23
(cherry picked from commit c65f43cb989f7e1ad5a8b999e6f3e266cddb36ee)
(cherry picked from commit 9dbf2967bee1060ae7419897942dfe554432a742)
9d1b6b8a9f