Add BGP EVPN support to the FRR service

Depends-On: https://review.opendev.org/c/openstack/tripleo-ansible/+/798626
Change-Id: I062f82a001c3edeade13912ed9b044695143de85

deployment/frr/frr-container-ansible.yaml

@@ -111,6 +111,31 @@ parameters:
                  allowed to become neighbors. Setting value to zero or less
                  will disable GTSM.
     type: number
+  FrrBgpL2VpnEnabled:
+    type: boolean
+    default: false
+    description: Enable BGP L2VPN EVPN address family.
+  FrrBgpL2VpnEbgpMultihop:
+    type: number
+    default: 0
+    description: >
+      Allows sessions with eBGP neighbors to establish when they are multiple
+      hops away. Value 0 disables multi-hop eBGP peering.
+  FrrBgpL2VpnUplinkActivate:
+    type: boolean
+    default: true
+    description: >
+      Enable the list of uplink network interfaces defined in FrrBgpUplinks.
+  FrrBgpL2VpnPeers:
+    default: []
+    description: List of EVPN neighbor peers.
+    type: comma_delimited_list
+  FrrBgpL2vpnPeersScope:
+    default: 'external'
+    type: string
+    description: Either peer with internal (iBGP) or external (eBGP) neighbors.
+    constraints:
+      - allowed_values: ['internal', 'external']
 
 outputs:
   role_data:
@@ -223,6 +248,11 @@ outputs:
             tripleo_frr_bgp_uplinks_scope: {get_param: FrrBgpUplinksScope}
             tripleo_frr_log_level: {get_param: FrrLogLevel}
             tripleo_frr_zebra: {get_param: FrrZebraEnabled}
+            tripleo_frr_bgp_l2vpn: {get_param: FrrBgpL2VpnEnabled}
+            tripleo_frr_bgp_l2vpn_ebgp_multihop: {get_param: FrrBgpL2VpnEbgpMultihop}
+            tripleo_frr_bgp_l2vpn_uplink_activate: {get_param: FrrBgpL2VpnUplinkActivate}
+            tripleo_frr_bgp_l2vpn_peers: {get_param: FrrBgpL2VpnPeers}
+            tripleo_frr_bgp_l2vpn_peers_scope: {get_param: FrrBgpL2vpnPeersScope}
         - name: Start FRR
           include_role:
             name: tripleo_container_manage