Re-enable master LB in test cluster.

Author: jlamillan

tests/resources/configs/public-cluster.tfvars

@@ -7,7 +7,7 @@ vcn_dns_name = "k8soci"
 domain_name = "k8soci.oraclevcn.com"
 control_plane_subnet_access = "public"
 k8s_master_lb_access = "public"
-master_oci_lb_enabled = "false"
+master_oci_lb_enabled = "true"
 etcd_lb_enabled = "false"
 etcdShape = "VM.Standard2.4"
 k8sMasterShape = "VM.Standard2.8"