use db utils from lib

The APIs our consumers are using from neutron.db_utils were rehomed into
neutron-lib with https://review.openstack.org/#/c/540161/ and will be
consumed in neutron with https://review.openstack.org/#/c/565593

This patch switches the applicable imports over to neutron-lib.
It also bumps neutron-lib up to 1.16.0.
A shim is added to determine which db utils to patch due to bug:
https://bugs.launchpad.net/tricircle/+bug/1776922

Change-Id: If41f998453d2c6492ceebd2985e457b57e21b0f1

requirements.txt

@@ -16,7 +16,7 @@ keystoneauth1>=3.4.0 # Apache-2.0
 keystonemiddleware>=4.17.0 # Apache-2.0
 netaddr>=0.7.18 # BSD
 netifaces>=0.10.4 # MIT
-neutron-lib>=1.14.0 # Apache-2.0
+neutron-lib>=1.16.0 # Apache-2.0
 retrying!=1.3.0,>=1.2.3 # Apache-2.0
 SQLAlchemy!=1.1.5,!=1.1.6,!=1.1.7,!=1.1.8,>=1.0.10 # MIT
 WebOb>=1.7.1 # MIT

tricircle/tests/unit/network/test_central_plugin.py

@@ -25,6 +25,7 @@
 from neutron_lib.api.definitions import portbindings
 from neutron_lib.api.definitions import provider_net
 import neutron_lib.constants as q_constants
+from neutron_lib.db import utils as lib_db_utils
 import neutron_lib.exceptions as q_lib_exc
 from neutron_lib.exceptions import availability_zone as az_exc
 from neutron_lib.plugins import constants as plugin_constants
@@ -72,6 +73,13 @@
 import tricircle.tests.unit.utils as test_utils
 from tricircle.xjob import xmanager
 
+
+# TODO(boden): remove when https://review.openstack.org/#/c/565593/ lands
+if hasattr(_utils, 'filter_non_model_columns'):
+    db_utils = _utils
+else:
+    db_utils = lib_db_utils
+
 _resource_store = test_utils.get_resource_store()
 TOP_NETS = _resource_store.TOP_NETWORKS
 TOP_SUBNETS = _resource_store.TOP_SUBNETS
@@ -1949,7 +1957,7 @@ def test_update_subnet_enable_disable_dhcp(self, mock_context):
                   '_update_ips_for_port', new=fake_update_ips_for_port)
     @patch.object(directory, 'get_plugin', new=fake_get_plugin)
     @patch.object(driver.Pool, 'get_instance', new=fake_get_instance)
-    @patch.object(_utils, 'filter_non_model_columns',
+    @patch.object(db_utils, 'filter_non_model_columns',
                   new=fake_filter_non_model_columns)
     @patch.object(context, 'get_context_from_neutron_context')
     def test_update_port(self, mock_context):
@@ -2035,7 +2043,7 @@ def test_update_port(self, mock_context):
 
     @patch.object(directory, 'get_plugin', new=fake_get_plugin)
     @patch.object(driver.Pool, 'get_instance', new=fake_get_instance)
-    @patch.object(_utils, 'filter_non_model_columns',
+    @patch.object(db_utils, 'filter_non_model_columns',
                   new=fake_filter_non_model_columns)
     @patch.object(context, 'get_context_from_neutron_context')
     def test_update_bound_port_mac(self, mock_context):
@@ -2064,7 +2072,7 @@ def test_update_bound_port_mac(self, mock_context):
 
     @patch.object(directory, 'get_plugin', new=fake_get_plugin)
     @patch.object(driver.Pool, 'get_instance', new=fake_get_instance)
-    @patch.object(_utils, 'filter_non_model_columns',
+    @patch.object(db_utils, 'filter_non_model_columns',
                   new=fake_filter_non_model_columns)
     @patch.object(context, 'get_context_from_neutron_context')
     def test_update_non_vm_port(self, mock_context):
@@ -2101,7 +2109,7 @@ def test_update_non_vm_port(self, mock_context):
 
     @patch.object(FakeRPCAPI, 'setup_shadow_ports')
     @patch.object(driver.Pool, 'get_instance', new=fake_get_instance)
-    @patch.object(_utils, 'filter_non_model_columns',
+    @patch.object(db_utils, 'filter_non_model_columns',
                   new=fake_filter_non_model_columns)
     @patch.object(context, 'get_context_from_neutron_context')
     def test_update_vm_port(self, mock_context, mock_setup):