[NSX-p] Check for a LB before enabling/disabling service router

Change-Id: I7db94c9290dd4c7876f008f7cd82c66cbcd39d63

vmware_nsx/plugins/nsx_p/plugin.py

@@ -1563,8 +1563,9 @@ class NsxPolicyPlugin(nsx_plugin_common.NsxPluginV3Base):
         router_subnets = self._find_router_subnets(
             context.elevated(), router_id)
         sr_currently_exists = self.verify_sr_at_backend(router_id)
-        lb_exist = False
+        lb_exist = self.service_router_has_loadbalancers(context, router_id)
         fw_exist = self._router_has_edge_fw_rules(context, router)
+        # TODO(asarfaty): Add vpnaas check here
         actions = self._get_update_router_gw_actions(
             org_tier0_uuid, orgaddr, org_enable_snat,
             new_tier0_uuid, newaddr, new_enable_snat,

vmware_nsx/tests/unit/nsx_p/test_plugin.py

@@ -1435,6 +1435,9 @@ class NsxPTestL3NatTestCase(NsxPTestL3NatTest,
     def setUp(self, *args, **kwargs):
         super(NsxPTestL3NatTestCase, self).setUp(*args, **kwargs)
 
+        mock.patch.object(self.plugin.nsxpolicy, 'search_by_tags',
+                          return_value={'results': []}).start()
+
     def test__notify_gateway_port_ip_changed(self):
         self.skipTest('not supported')
 

vmware_nsx/tests/unit/services/vpnaas/test_nsxp_vpnaas.py

@@ -540,6 +540,9 @@ class TestVpnaasDriver(test_plugin.NsxPPluginTestCaseMixin):
         self.policy_vpn = self.plugin.nsxpolicy.ipsec_vpn
         self.l3plugin = self.plugin
 
+        mock.patch.object(self.plugin.nsxpolicy, 'search_by_tags',
+                          return_value={'results': []}).start()
+
     @contextlib.contextmanager
     def router(self, name='vpn-test-router', tenant_id=_uuid(),
                admin_state_up=True, **kwargs):