Skip new instance port admin state test for ironic

This new test toggles the admin state of instance ports and
expects this to alter connectivity via public IP.  However,
baremetal instances are attached to physical ports that cannot
be switched up and down via neutron.  This adds a skip in this
case.

Change-Id: I908331a913fbe791a04d20060deb5a0001367b67
diff --git a/tempest/scenario/test_network_basic_ops.py b/tempest/scenario/test_network_basic_ops.py
index 265f9e5..aeb73a9 100644
--- a/tempest/scenario/test_network_basic_ops.py
+++ b/tempest/scenario/test_network_basic_ops.py
@@ -492,6 +492,9 @@
         ssh_client.renew_lease(fixed_ip=floating_ip['fixed_ip_address'])
         self._check_dns_server(ssh_client, [alt_dns_server])
 
+    @testtools.skipIf(CONF.baremetal.driver_enabled,
+                      'admin_state of instance ports cannot be altered '
+                      'for baremetal nodes')
     @test.attr(type='smoke')
     @test.services('compute', 'network')
     def test_update_instance_port_admin_state(self):