Remove unnecessary rootwrap_config

It was already removed from the "clean" deployments, see
openstack-k8s-operators/architecture#573
which states:
"Privileged operations should be managed by securityContext provided
by k8s."

Author: tosky

tests/roles/glance_adoption/templates/glance_cinder.yaml.j2

@@ -14,7 +14,6 @@ spec:
           [glance_store]
           default_backend = default_backend
           [default_backend]
-          rootwrap_config = /etc/glance/rootwrap.conf
           description = Default cinder backend
           cinder_store_auth_address = {{ .KeystoneInternalURL }}
           cinder_store_user_name = {{ .ServiceUser }}