Prevent the abusive restart of the octavia services

The octavia services were always restarted when running the
ansible-playbook

1. The 'Bring the management port interface up' task should only be run
   if the 'create octavia management interface' task changed.
   Add a when clause that checks the output of the previous task.
2. A 'when' clause compares 2 strings, but one of the strings always
   starts with a whitespace, while the other string doesn't.
   Trim the output of a task to make sure the strings are formatted
   correctly.

Closes-Bug: 1964099
Change-Id: Ic46ba50c7200d5b4eacd1ee8c03d135bdcc2e353
(cherry picked from commit 78d58174c3)

tripleo_ansible/roles/octavia_controller_config/tasks/netinterface.yml

@@ -13,6 +13,7 @@
   template:
     dest: "/etc/sysconfig/network-scripts/ifcfg-{{ mgmt_port_dev }}"
     src: "ifcfg.j2"
+  register: octavia_ifcfg_file
 
 - name: Bring the management port interface up
   become: true
@@ -20,3 +21,5 @@
   command: "ifup {{ mgmt_port_dev }}"
   notify:
     - octavia config updated
+  when:
+    - octavia_ifcfg_file.changed|bool

tripleo_ansible/roles/octavia_controller_post_config/tasks/main.yml

@@ -71,7 +71,7 @@
 
 - name: retrieve current ip list
   set_fact:
-    current_ip_list: "{{ config_contents.stdout }}"
+    current_ip_list: "{{ config_contents.stdout | trim }}"
 
 # This isn't perfect as they execution order will make them not match, but we can avoid a restart
 # if things have stayed the same.