Fix bogus reference to conditional in octavia upgrade tasks

Adds a fact to take the value of the EnableInternalTLS heat parameter so
it can be used in ansible upgrade tasks.

Change-Id: I9e52ece33a131fbcec64d96d3c9c273f98ccb284
Closes-Bug: #1836729
(cherry picked from commit 430cb55920)
(cherry picked from commit 9f239f8c80)

docker/services/octavia-api.yaml

@@ -211,6 +211,9 @@ outputs:
               /var/log/containers/octavia and /var/log/containers/httpd/octavia-api.
           ignore_errors: true
       update_tasks:
+        - name: Set internal tls variable
+          set_fact:
+            internal_tls_enabled: {get_param: EnableInternalTLS}
         - name: remove TLS proxy if configured and running
           when:
             - step|int == 2
@@ -219,6 +222,9 @@ outputs:
             name: octavia_api_tls_proxy
             state: absent
       upgrade_tasks:
+        - name: Set internal tls variable
+          set_fact:
+            internal_tls_enabled: {get_param: EnableInternalTLS}
         - when: step|int == 0
           tags: common
           block: