gnocchi: do not install cradox
gnocchi: do not install cradox

Project description says:

/!DON’T USE IT, but use upstream python-rados, except you really can’t /!

Also installing it created errors which are silently ignored.

Change-Id: Id24458cd655aeace0e745c512aa7890b3edda51c

openstack/kolla,openstack/kolla