Add Octavia anti-affinity parameters

This patch adds the following parameter for Octavia:

1. OctaviaAntiAffinity

The default value is 'true' as is a best practice for production
deployments.

Depends-On: https://review.opendev.org/694832
Change-Id: I1adb886405cde6b6e0b5f25a735e36114cd1787b

deployment/octavia/octavia-base.yaml

@@ -193,6 +193,10 @@ parameters:
     description: When true, logs will not be stored on the amphora filesystem.
                  This includes all kernel, system, and security logs.
     type: boolean
+  OctaviaAntiAffinity:
+    default: true
+    description: Flag to indicate if anti-affinity feature is turned on.
+    type: boolean
 
 conditions:
   service_debug_unset: {equals : [{get_param: OctaviaDebug}, '']}
@@ -267,6 +271,7 @@ outputs:
             octavia::controller::user_log_facility: {get_param: OctaviaTenantLogFacility}
             octavia::controller::user_log_format: {get_param: OctaviaUserLogFormat}
             octavia::controller::disable_local_log_storage: {get_param: OctaviaDisableLocalLogStorage}
+            octavia::controller::enable_anti_affinity: {get_param: OctaviaAntiAffinity}
           -
             if:
             - octavia_topology_unset

releasenotes/notes/add-octavia-anti-affinity-parameters-fe9222f17b16ee1f.yaml

@@ -0,0 +1,4 @@
+---
+features:
+  - |
+    Added the Octavia anti-affinity parameters.