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] https://github.com/ansible/ansible-modules-core/issues/1497

Change-Id: I171c4d7d6e051b69106156df797ea96d6184014a

meta/main.yml

@@ -18,7 +18,7 @@ galaxy_info:
   description: Rsyslog log client setup
   company: Rackspace
   license: Apache2
-  min_ansible_version: 1.6.6
+  min_ansible_version: 2.2
   platforms:
     - name: Ubuntu
       versions:

tasks/rsyslog_client_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 rsyslog packages
   package:
     pkg: "{{ item }}"
     state: "{{ rsyslog_client_package_state }}"
+    update_cache: "{{ (ansible_pkg_mgr == 'apt') | ternary('yes', omit) }}"
+    cache_valid_time: "{{ (ansible_pkg_mgr == 'apt') | ternary(cache_timeout, omit) }}"
   register: install_packages
   until: install_packages|success
   retries: 5