Optimise apt cache update task

The update of the apt cache and the package installation
can all be handled in a single task by providing the
package action plugin with the right parameters. This
removes an extra task to optimise execution.

The minimum Ansible version is raised to 2.2 due to a
known bug [1] in Ansible's apt module which does not
update the cache properly if the cache update and the
install are combined in a single task.

[1] ansible/ansible-modules-core#1497

Change-Id: I69970a3a76e6ac56095d0077c31f811d717d9216
(cherry picked from commit 9d43b6f)

meta/main.yml

@@ -18,7 +18,7 @@ galaxy_info:
   description: Installation and setup of neutron
   company: Rackspace
   license: Apache2
-  min_ansible_version: 2.0
+  min_ansible_version: 2.2
   platforms:
     - name: Ubuntu
       versions:

tasks/neutron_install.yml

@@ -13,17 +13,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-- name: Ensure apt cache is up to date
-  apt:
-    update_cache: yes
-    cache_valid_time: "{{ cache_timeout }}"
-  when:
-    - ansible_pkg_mgr == 'apt'
-
 - name: Install neutron role packages
   package:
     name: "{{ item }}"
     state: "{{ neutron_package_state }}"
+    update_cache: "{{ (ansible_pkg_mgr == 'apt') | ternary('yes', omit) }}"
+    cache_valid_time: "{{ (ansible_pkg_mgr == 'apt') | ternary(cache_timeout, omit) }}"
   with_items:
     - "{{ neutron_packages_list | selectattr('enabled') | sum(attribute='packages', start=[]) }}"
   when: