change host_containers group names in inventory

In user config, when choosing host names inspired
from containers group names, this will lead in the code
to have host_containers to be identical to group_containers.
This will eventually lead to unintentially having groups added
to itselves in the inventory which will lead to unending
recursion loop in the dynamic_inventory.py.
Changing the way we construct the name of host_containers
will prevent that.

Change-Id: I5edb6091cb10588099f023f3ae961ed714aea2ce
Closes-Bug: 1512883
Closes-Bug: 1528953

playbooks/inventory/dynamic_inventory.py

@@ -231,7 +231,7 @@ def _build_container_hosts(container_affinity, container_hosts, type_and_name,
                 address = host_type_config.get('ip')
 
             # Create a host types containers group and append it to inventory
-            host_type_containers = '%s_containers' % host_type
+            host_type_containers = '%s-host_containers' % host_type
             append_if(array=container_mapping, item=host_type_containers)
 
             hostvars_options.update({
@@ -373,7 +373,7 @@ def _add_container_hosts(assignment, config, container_name, container_type,
             )
 
         physical_host = inventory['_meta']['hostvars'][host_type]
-        container_host_type = '%s_containers' % host_type
+        container_host_type = '%s-host_containers' % host_type
         if 'container_types' not in physical_host:
             physical_host['container_types'] = container_host_type
         elif physical_host['container_types'] != container_host_type:

releasenotes/notes/inventory_host_containers_naming-d1f42a0c91d68154.yaml

@@ -0,0 +1,11 @@
+---
+fixes:
+  - Changed the way we name host containers groups in
+    dynamic_inventory.py for a hostname from
+    hostname_containers to hostname-host_containers to
+    prevent failing in the case where containers groups
+    have the same name as host containers when choosing
+    hostnames inspired from containers group names. This
+    change fixes the following bugs
+    https://bugs.launchpad.net/openstack-ansible/+bug/1512883 and
+    https://bugs.launchpad.net/openstack-ansible/+bug/1528953.

tests/test_inventory.py

@@ -69,7 +69,7 @@ class TestAnsibleInventoryFormatConstraints(unittest.TestCase):
     inventory = None
 
     expected_groups = [
-        'aio1_containers',
+        'aio1-host_containers',
         'all',
         'all_containers',
         'aodh_alarm_evaluator',