don't link manila for /home to manila for /project in caas (#363)

Author: sjpb

environments/.caas/inventory/group_vars/all/cluster.yml

@@ -23,4 +23,4 @@ appliances_state_dir: /var/lib/state
 
 # Defaults for caas-provided extravars:
 cluster_project_manila_share: false
-cluster_home_manila_share: "{{ cluster_project_manila_share }}"
+cluster_home_manila_share: false