Use list of cluster member for ovn ml2 agent to directly connect

Use list of cluster member in ovn/ml2 agent to directly talk to nb/sb
central services instead of using haproxy lb. ovn-controller agent
automatically monitor cluster member and remove them from list if
they are dead or not reachable. This is better approch then using
haproxy lb.

Change-Id: Icb490225ff34354b3f5821c5f7a54a039091c924

defaults/main.yml

@@ -443,7 +443,8 @@ neutron_ovn_primary_cluster_node: "{{ groups[neutron_services['neutron-ovn-north
 neutron_ovn_northd_service_name: ovn-northd
 neutron_ovn_controller_service_name: ovn-controller
 neutron_ovn_l3_scheduler: leastloaded
-neutron_ovn_ip: "{{ internal_lb_vip_address }}"
+neutron_ovn_nb_connection: "tcp:{{ groups['neutron_ovn_northd'] | map('extract', hostvars, ['ansible_host']) | join(':6641,tcp:') }}:6641"
+neutron_ovn_sb_connection: "tcp:{{ groups['neutron_ovn_northd'] | map('extract', hostvars, ['ansible_host']) | join(':6642,tcp:') }}:6642"
 neutron_ovsdb_manager: ptcp:6640:127.0.0.1
 
 ###

tasks/providers/setup_ovs_ovn.yml

@@ -27,7 +27,7 @@
     - neutron_services['neutron-ovn-controller']['group'] in group_names
 
 - name: Configure OVN Southbound Connection
-  command: "ovs-vsctl set open . external-ids:ovn-remote=tcp:{{ neutron_ovn_ip }}:6642"
+  command: "ovs-vsctl set open . external-ids:ovn-remote={{ neutron_ovn_sb_connection }}"
   when:
     - neutron_services['neutron-ovn-controller']['group'] in group_names
 

templates/plugins/ml2/ml2_conf.ini.j2

@@ -48,8 +48,8 @@ max_header_size = 38
 
 [ovn]
 ovn_native_dhcp = True
-ovn_nb_connection = tcp:{{ neutron_ovn_ip }}:6641
-ovn_sb_connection = tcp:{{ neutron_ovn_ip }}:6642
+ovn_nb_connection = {{ neutron_ovn_nb_connection }}
+ovn_sb_connection = {{ neutron_ovn_sb_connection }}
 ovn_l3_scheduler = {{ neutron_ovn_l3_scheduler }}
 ovn_metadata_enabled = True