Updated openstack/openstack
Project: openstack-dev/devstack  85eff17436d0241767c163cffcebbc61e553d221

Ceph: undefine secret from nova.conf when deleting secret

At teardown time we delete the libvirt secret but leave
nova.conf referencing the stale UUID.  Remove it to make
debugging and repeated runs less error-prone.

Additionally, only try to delete secret if it Cinder is
enabled (causing it to be defined when deploying devstack).

Change-Id: Id5e1290b8dcfd79238f02e31084ab12c3d6aed5f