Cleanup syntax issues for Ansible 2 compatibility

This patch fixes a few syntax issues required for Ansible 2
compatibility that Ansible 1.x was more lenient with.

When a 'when' clause is combined with a 'with_*' statement, the clause
is processed separately for each item. Tasks with 'when' clauses which
depended on an item variable being defined have either applied a default
empty value to the item or a new task individual task has been created
for each item in the loop.

Tasks within the os-cinder-install playboook have been updated to loop
through cinder_backends as a hash.

Change-Id: I9b53eb5dd709a6bed1797961015aa3dd328340f3

tasks/horizon_post_install.yml

@@ -53,7 +53,6 @@
     src: "{{ item.value.src }}"
     dest: "{{ horizon_lib_dir }}/openstack_dashboard/static/dashboard/{{ item.value.dest }}"
   with_dict: "{{ horizon_custom_uploads | default({}) }}"
-  when: horizon_custom_uploads is defined
   tags:
     - horizon-branding
 

tasks/horizon_ssl_user_provided.yml

@@ -13,17 +13,27 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-- name: Drop user provided ssl cert and key
+- name: Drop user provided ssl cert
   copy:
-    src: "{{ item.src }}"
-    dest: "{{ item.dest }}"
+    src: "{{ horizon_user_ssl_cert }}"
+    dest: "{{ horizon_ssl_cert }}"
     owner: "root"
     group: "root"
-    mode: "{{ item.mode }}"
-  with_items:
-    - { src: "{{ horizon_user_ssl_cert }}", dest: "{{ horizon_ssl_cert }}", mode: "0644" }
-    - { src: "{{ horizon_user_ssl_key }}", dest: "{{ horizon_ssl_key }}", mode: "0640" }
-  when: horizon_user_ssl_cert is defined and horizon_user_ssl_key is defined
+    mode: "0644"
+  when: horizon_user_ssl_cert is defined
+  notify: Restart apache2
+  tags:
+    - horizon-configs
+    - horizon-ssl
+
+- name: Drop user provided ssl key
+  copy:
+    src: "{{ horizon_user_ssl_key }}"
+    dest: "{{ horizon_ssl_key }}"
+    owner: "root"
+    group: "root"
+    mode: "0640"
+  when: horizon_user_ssl_key is defined
   notify: Restart apache2
   tags:
     - horizon-configs