Do not delete containers named rpc.*

If leapfrogging from Kilo (and above) with a host named rpc.*
all the containers will be wiped during the step
``neutron-remove-old-containers.yml``.

Change-Id: I2e1106bcce12547d6ab9e0384cd96d5e0194001d

leap-upgrades/upgrade-utilities/neutron-container-forget.sh

@@ -36,6 +36,7 @@ pushd ${MAIN_PATH}/playbooks
   REMOVED_CONTAINERS+="$(get_inv_items 'neutron_agent' | awk '{print $2}') "
 
   for i in ${REMOVED_CONTAINERS};do
+    echo "$i" >> /etc/openstack_deploy/leapfrog_remove_remaining_old_containers
     remove_inv_items $i
   done
 

leap-upgrades/upgrade-utilities/neutron-remove-old-containers.yml

@@ -18,9 +18,9 @@
   gather_facts: false
   user: root
   tasks:
-    - name: Search for and destroy reminent RPC grouped containers
+    - name: Search for old containers not yet deleted
       shell: >-
-        lxc-ls -f | awk '/rpc/ {print $1}' | xargs -n 1 lxc-destroy -fn
+        while read line; do lxc-destroy -fn $line; done < /etc/openstack_deploy/leapfrog_remove_remaining_old_containers
       failed_when: false
       args:
         executable: /bin/bash