Merge "CI: stop setting ceph_nova_user" into stable/wallaby

Author: Zuul

tests/templates/globals-default.j2

@@ -121,7 +121,6 @@ enable_cinder: "yes"
 glance_backend_ceph: "yes"
 cinder_backend_ceph: "yes"
 nova_backend_ceph: "yes"
-ceph_nova_user: "cinder"
 
 # TODO(yoctozepto): Remove this in the Xena cycle.
 # cephadm doesn't support chrony in a container (checks for chrony.service)