Support custom keepalived config

Allow users to use the custom config mechanism for Keepalived
provided by Kolla Ansible.

Change-Id: I052bd8283944197cd2b13747e7a7c32fbe06c045
Story: 2005211
Task: 29989

ansible/roles/kolla-openstack/vars/main.yml

@@ -100,6 +100,11 @@ kolla_openstack_custom_config:
     dest: "{{ kolla_node_custom_config_path }}/keystone"
     patterns: "*"
     enabled: true
+  # Keepalived.
+  - src: "{{ kolla_extra_config_path }}/keepalived"
+    dest: "{{ kolla_node_custom_config_path }}/keepalived"
+    patterns: "*"
+    enabled: "{{ kolla_enable_haproxy }}"
   # Magnum.
   - src: "{{ kolla_extra_config_path }}/magnum"
     dest: "{{ kolla_node_custom_config_path }}/magnum"

doc/source/configuration/kolla-ansible.rst

@@ -162,6 +162,7 @@ which files are supported.
    ``ironic.conf``                 Ironic configuration.
    ``ironic/*``                    Extended ironic configuration.
    ``keystone/*``                  Extended keystone configuration.
+   ``keepalived/*``                Extended keepalived configuration.
    ``magnum.conf``                 Magnum configuration.
    ``magnum/*``                    Extended magnum configuration.
    ``manila.conf``                 Manila configuration.

releasenotes/notes/add_support_for_custom_keepalived_conf-b26a242761c1f5b3.yaml

+---
+features:
+  - Adds support for custom Keepalived configuration.