add support for custom calico port (#7419)

roles/network_plugin/calico/defaults/main.yml

@@ -96,3 +96,6 @@ typha_max_connections_lower_limit: 300
 typha_secure: false
 
 calico_feature_control: {}
+
+# Calico default BGP port
+calico_bgp_listen_port: 179

roles/network_plugin/calico/tasks/install.yml

@@ -207,6 +207,7 @@
           "name": "default",
       },
       "spec": {
+          "listenPort": {{ calico_bgp_listen_port }},
           "logSeverityScreen": "Info",
           {% if not calico_no_global_as_num|default(false) %}"asNumber": {{ global_as_num }},{% endif %}
           "nodeToNodeMeshEnabled": {{ nodeToNodeMeshEnabled|default('true') }} ,