Fix deprecation warning for undefined variables

'with_' clauses are evaluated before 'when' clauses. In Ansible 1.9
the task is silently skipped when a variable within a 'with_' clause is
undefined, Ansible 2 provides a deprecation warning.

Separate the task deploying a user provided ssl cert and key into
two and check them individually for 'haproxy_user_ssl_cert' or
'haproxy_user_ssl_key' being defined.

Change-Id: I75367fe25d15d35ff60203b7c1d78437d613404d

playbooks/roles/haproxy_server/tasks/haproxy_ssl_configuration.yml

@@ -13,19 +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: Deploy user provided ssl cert
   copy:
-    src: "{{ item.src }}"
-    dest: "{{ item.dest }}"
+    src: "{{ haproxy_user_ssl_cert }}"
+    dest: "{{ haproxy_ssl_cert }}"
     owner: "root"
     group: "root"
-    mode: "{{ item.mode }}"
-  with_items:
-    - { src: "{{ haproxy_user_ssl_cert }}", dest: "{{ haproxy_ssl_cert }}", mode: "0644" }
-    - { src: "{{ haproxy_user_ssl_key }}", dest: "{{ haproxy_ssl_key }}", mode: "0640" }
-  when:
-    - haproxy_user_ssl_cert is defined
-    - haproxy_user_ssl_key is defined
+    mode: "0644"
+  when: haproxy_user_ssl_cert is defined
+  notify:
+    - regen pem
+  tags:
+    - haproxy-ssl
+
+- name: Deploy user provided ssl key
+  copy:
+    src: "{{ haproxy_user_ssl_key }}"
+    dest: "{{ haproxy_ssl_key }}"
+    owner: "root"
+    group: "root"
+    mode: "0600"
+  when: haproxy_user_ssl_key is defined
   notify:
     - regen pem
   tags: