Set default values for openshift_gcp_master_healthcheck_port and openshift_gcp_kubernetes_api_port

roles/openshift_gcp/defaults/main.yml

@@ -64,6 +64,8 @@ openshift_gcp_multizone: False
 provision_custom_repositories: []
 
 mcd_port: 49500
+openshift_gcp_kubernetes_api_port: 6443
+openshift_gcp_master_healthcheck_port: 8080
 
 openshift_gcp_firewall_rules:
   - rule: icmp