Improve docker API version retrieval

The current method does not work due to CLI output formatting
changes. We improve it to render the client output using toml,
which should be more future proof.

This change also disables pinging of the neutron router during
tempest tests, a combined patch is required to pass tests.

Change-Id: I7f611ffd095ca690baba3a987d8eb0b8407fade1

tasks/zun_post_install.yml

@@ -16,14 +16,17 @@
 - name: Define the docker api
   block:
     - name: Get docker api version
-      command: "docker version"
+      command: >-
+        {% raw %}
+        docker version -f "{{.Client.APIVersion }}"
+        {% endraw %}
       failed_when: false
       changed_when: false
       register: docker_version
 
     - name: Set docker api version fact
       set_fact:
-        zun_docker_api_version: "{{ (docker_version.stdout | from_yaml)['Client']['API version'] }}"
+        zun_docker_api_version: "{{ docker_version.stdout | trim }}"
   when:
     - zun_services['zun-compute']['group'] in group_names
 

tests/group_vars/all_containers.yml

@@ -13,6 +13,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+tempest_network_ping_gateway: False
+
 container_networks:
   management_address:
     address: "{{ ansible_host }}"