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: I29969fba8fe4197bdff2d74194ac5714e22202a8

handlers/main.yml

@@ -42,5 +42,5 @@
     name: "{{ item }}"
     state: "restarted"
     pattern: "{{ item }}"
-  with_items: aodh_service_names
+  with_items: "{{ aodh_service_names }}"
   failed_when: false

tasks/aodh_install.yml

@@ -72,7 +72,7 @@
   until: install_packages|success
   retries: 5
   delay: 2
-  with_items: aodh_requires_pip_packages
+  with_items: "{{ aodh_requires_pip_packages }}"
   tags:
     - aodh-install
     - aodh-pip-packages
@@ -189,7 +189,7 @@
   until: install_packages|success
   retries: 5
   delay: 2
-  with_items: aodh_pip_packages
+  with_items: "{{ aodh_pip_packages }}"
   when:
     - aodh_venv_enabled | bool
     - aodh_get_venv | failed or aodh_developer_mode | bool
@@ -207,7 +207,7 @@
   until: install_packages|success
   retries: 5
   delay: 2
-  with_items: aodh_pip_packages
+  with_items: "{{ aodh_pip_packages }}"
   when:
     - not aodh_developer_mode | bool
     - not aodh_venv_enabled | bool

tasks/aodh_install_apt.yml

@@ -38,7 +38,7 @@
   until: install_packages|success
   retries: 5
   delay: 2
-  with_items: aodh_apt_packages
+  with_items: "{{ aodh_apt_packages }}"
   tags:
     - aodh-install
     - aodh-apt-packages

tasks/main.yml

@@ -17,7 +17,7 @@
   fail:
     msg: "Please set the {{ item }} variable prior to applying this role."
   when: (item is undefined) or (item is none)
-  with_items: aodh_required_secrets
+  with_items: "{{ aodh_required_secrets }}"
   tags:
     - always