Address Ansible bare variable usage

When executing the role with Ansible 2.1, the following
deprecation warning is issued in the output for some tasks.

[DEPRECATION WARNING]: Using bare variables is deprecated.

This patch addresses the tasks to fix the behaviour appropriately.

Change-Id: Id61f978d9848626a9e3e9ca84228780bb9fc067d

tasks/barbican_install_apt.yml

@@ -29,4 +29,4 @@
   until: install_barbican_apt_packages |success
   retries: 5
   delay: 2
-  with_items: barbican_apt_packages
+  with_items: "{{ barbican_apt_packages }}"

tasks/install.yml

@@ -87,7 +87,7 @@
   until: install_barbican_pip_packages |success
   retries: 5
   delay: 2
-  with_items: barbican_pip_packages
+  with_items: "{{ barbican_pip_packages }}"
   tags:
     - barbican-install
     - barbican-pip-packages

tasks/main.yml

@@ -44,10 +44,8 @@
 
 - name: Restart Barbican Services
   service:
-    name: "{{ item }}"
+    name: "{{ barbican_uwsgi_program_name }}"
     state: "restarted"
-  with_items:
-    - "{{ barbican_uwsgi_program_name }}"
 
 - name: Flush handlers
   meta: flush_handlers

tasks/service-setup.yml

@@ -69,7 +69,7 @@
   until: ensure_barbican_roles |success
   retries: 5
   delay: 2
-  with_items: barbican_service_role_names
+  with_items: "{{ barbican_service_role_names }}"
   tags:
     - barbican-api-setup
     - barbican-role-setup

tests/test-barbican-functional.yml

@@ -41,7 +41,7 @@
     - name: Register secret location
       set_fact:
         secret_ref: "{{ item.split('|')[2] }}"
-      with_items: barbican_secret_store.stdout_lines
+      with_items: "{{ barbican_secret_store.stdout_lines }}"
       when: item.find('Secret href') != -1
     - name: Retrieve test secret
       shell: |