rehome port security api-def

This patch rehomes neutron's port security api-def
into neutron-lib as well as it's associated exceptions.

Change-Id: I0ba12f6eef06c22973024573deaecd80c6b248de

neutron_lib/exceptions/port_security.py

@@ -0,0 +1,26 @@
+# All rights reserved.
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+from neutron_lib._i18n import _
+from neutron_lib import exceptions
+
+
+class PortSecurityPortHasSecurityGroup(exceptions.InUse):
+    message = _("Port has security group associated. Cannot disable port "
+                "security or IP address until security group is removed.")
+
+
+class PortSecurityAndIPRequiredForSecurityGroups(exceptions.InvalidInput):
+    message = _("Port security must be enabled and port must have an IP "
+                "address in order to use security groups.")