Set container_name as host_var in test inventory

The connection plugin no longer falls back on using the
inventory_hostname as the container_name. Set container_name as a host
var for each container in the test inventory.

Change-Id: Ic23a77d8f88ed890a219c410d37a94bd97037c53

tests/group_vars/all_containers.yml

@@ -13,7 +13,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-container_name: "{{ inventory_hostname }}"
 
 container_networks:
   management_address:

tests/host_vars/container1.yml

@@ -2,6 +2,7 @@
 ansible_host: 10.100.100.2
 ansible_become: True
 ansible_user: root
+container_name: container1
 lxc_container_config_list:
   - "{{ (hostvars[physical_host | default('localhost')]['ansible_distribution_version'] == '18.04') | ternary('lxc.apparmor.profile', 'lxc.aa_profile') }}=lxc-openstack"
   - "lxc.mount.entry=/openstack/{{ inventory_hostname }} opt/test1 none bind,create=dir 0 0"

tests/host_vars/container2.yml

@@ -2,6 +2,7 @@
 ansible_host: 10.100.100.3
 ansible_become: True
 ansible_user: root
+container_name: container2
 lxc_container_config_list:
   # The unconfined profile is causing problems with overlayfs. See https://bugs.launchpad.net/openstack-ansible/+bug/1612412
   # Use the lxc2 aa_profile key to test that it is correctly changed in-flight to the required lxc3 key on bionic

tests/host_vars/container3.yml

@@ -2,3 +2,4 @@
 ansible_host: 10.100.100.4
 ansible_become: True
 ansible_user: root
+container_name: container3