Added apt update tasks to everything using apt

This change adds a specific update task to all tasks that all the
apt ansible module. This change was done to ensure that the cache
is updated as expected when instructed to do so. The reason that
the cache update is being removed from the grouping is because
there is an upstream bug that is effecting the process by which
the apt cache is updated when there is a package list to process
within the same task. The work around to make this function as
expected is to move the update into its own task without a package
list.

Upstream Ansible bug:
  - ansible/ansible-modules-core#1497

Change-Id: Ic06d89a76d772c12888b4bc4bbf147be58b0c150
Related-Bug: 1464771

tasks/neutron_install.yml

@@ -13,12 +13,21 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+- name: Update apt sources
+  apt:
+    update_cache: yes
+    cache_valid_time: 600
+  register: apt_update
+  until: apt_update|success
+  retries: 5
+  delay: 2
+  tags:
+    - neutron-apt-packages
+
 - name: Install apt packages
   apt:
     pkg: "{{ item }}"
     state: latest
-    update_cache: yes
-    cache_valid_time: 600
   register: install_packages
   until: install_packages|success
   retries: 5