small fixes mostly variable names

roles/neutron-controller/tasks/main.yml

@@ -21,7 +21,7 @@
         -e "NOVA_PASSWORD=geheim"
         -e "NOVA_USER=nova"
         -e "MEMCACHED_HOST={{ hostvars[groups['memcached'][0]]['ansible_default_ipv4']['address'] }}"
-        -e "PROVIDER_INTERFACE_NAME={{ hostvars[groups['neutron-controller'][0]]['ansible_default_ipv4']['interface'] }}"
+        -e "PROVIDER_INTERFACE_NAME={{ provider_interface_name }}"
         -e "RABBIT_PASSWORD=geheim"
         -e "RABBIT_USER=openstack"
   tags: env