When we allow FLAT type, then we are getting the following test case error.
We need to look into the error in more detail.

ERROR [oslo_db.sqlalchemy.exc_filters] DBAPIError exception wrapped from (sqlite3.InterfaceError) Error binding parameter 0 - probably unsupported type. [SQL: u'SELECT ports.project_id AS ports_project_id, ports.id AS ports_id, ports.name AS ports_name, ports.network_id AS ports_network_id, ports.mac_address AS ports_mac_address, ports.admin_state_up AS ports_admin_state_up, ports.status AS ports_status, ports.device_id AS ports_device_id, ports.device_owner AS ports_device_owner, ports.ip_allocation AS ports_ip_allocation, ports.standard_attr_id AS ports_standard_attr_id, standardattributes_1.id AS standardattributes_1_id, standardattributes_1.resource_type AS standardattributes_1_resource_type, standardattributes_1.description AS standardattributes_1_description, standardattributes_1.revision_number AS standardattributes_1_revision_number, standardattributes_1.created_at AS standardattributes_1_created_at, standardattributes_1.updated_at AS standardattributes_1_updated_at, standardattributes_2.id AS standardattributes_2_id, standardattributes_2.resource_type AS standardattributes_2_resource_type, standardattributes_2.description AS standardattributes_2_description, standardattributes_2.revision_number AS standardattributes_2_revision_number, standardattributes_2.created_at AS standardattributes_2_created_at, standardattributes_2.updated_at AS standardattributes_2_updated_at, trunks_1.project_id AS trunks_1_project_id, trunks_1.id AS trunks_1_id, trunks_1.admin_state_up AS trunks_1_admin_state_up, trunks_1.name AS trunks_1_name, trunks_1.port_id AS trunks_1_port_id, trunks_1.status AS trunks_1_status, trunks_1.standard_attr_id AS trunks_1_standard_attr_id, portsecuritybindings_1.port_id AS portsecuritybindings_1_port_id, portsecuritybindings_1.port_security_enabled AS portsecuritybindings_1_port_security_enabled, portdnses_1.port_id AS portdnses_1_port_id, portdnses_1.current_dns_name AS portdnses_1_current_dns_name, portdnses_1.current_dns_domain AS portdnses_1_current_dns_domain, portdnses_1.previous_dns_name AS portdnses_1_previous_dns_name, portdnses_1.previous_dns_domain AS portdnses_1_previous_dns_domain, portdnses_1.dns_name AS portdnses_1_dns_name, portdnses_1.dns_domain AS portdnses_1_dns_domain, securitygroupportbindings_1.port_id AS securitygroupportbindings_1_port_id, securitygroupportbindings_1.security_group_id AS securitygroupportbindings_1_security_group_id, qos_port_policy_bindings_1.policy_id AS qos_port_policy_bindings_1_policy_id, qos_port_policy_bindings_1.port_id AS qos_port_policy_bindings_1_port_id, portbindingports_1.port_id AS portbindingports_1_port_id, portbindingports_1.host AS portbindingports_1_host, ml2_port_bindings_1.port_id AS ml2_port_bindings_1_port_id, ml2_port_bindings_1.host AS ml2_port_bindings_1_host, ml2_port_bindings_1.vnic_type AS ml2_port_bindings_1_vnic_type, ml2_port_bindings_1.profile AS ml2_port_bindings_1_profile, ml2_port_bindings_1.vif_type AS ml2_port_bindings_1_vif_type, ml2_port_bindings_1.vif_details AS ml2_port_bindings_1_vif_details, ml2_port_bindings_1.status AS ml2_port_bindings_1_status, subports_1.port_id AS subports_1_port_id, subports_1.trunk_id AS subports_1_trunk_id, subports_1.segmentation_type AS subports_1_segmentation_type, subports_1.segmentation_id AS subports_1_segmentation_id, portdataplanestatuses_1.port_id AS portdataplanestatuses_1_port_id, portdataplanestatuses_1.data_plane_status AS portdataplanestatuses_1_data_plane_status \nFROM ports LEFT OUTER JOIN standardattributes AS standardattributes_1 ON standardattributes_1.id = ports.standard_attr_id LEFT OUTER JOIN trunks AS trunks_1 ON ports.id = trunks_1.port_id LEFT OUTER JOIN standardattributes AS standardattributes_2 ON standardattributes_2.id = trunks_1.standard_attr_id LEFT OUTER JOIN portsecuritybindings AS portsecuritybindings_1 ON ports.id = portsecuritybindings_1.port_id LEFT OUTER JOIN portdnses AS portdnses_1 ON ports.id = portdnses_1.port_id LEFT OUTER JOIN securitygroupportbindings AS securitygroupportbindings_1 ON ports.id = securitygroupportbindings_1.port_id LEFT OUTER JOIN qos_port_policy_bindings AS qos_port_policy_bindings_1 ON ports.id = qos_port_policy_bindings_1.port_id LEFT OUTER JOIN portbindingports AS portbindingports_1 ON ports.id = portbindingports_1.port_id LEFT OUTER JOIN ml2_port_bindings AS ml2_port_bindings_1 ON ports.id = ml2_port_bindings_1.port_id LEFT OUTER JOIN subports AS subports_1 ON ports.id = subports_1.port_id LEFT OUTER JOIN portdataplanestatuses AS portdataplanestatuses_1 ON ports.id = portdataplanestatuses_1.port_id \nWHERE ports.id = ?'] [parameters: (<MagicMock name='L3RouterPlugin().get_floatingip().get()' id='140532402478416'>,)]
2017-08-10 00:51:05.949524 |     Traceback (most recent call last):
2017-08-10 00:51:05.949581 |       File "/home/jenkins/workspace/gate-networking-onos-python27-ubuntu-xenial/.tox/py27/local/lib/python2.7/site-packages/sqlalchemy/engine/base.py", line 1182, in _execute_context
2017-08-10 00:51:05.949601 |         context)
2017-08-10 00:51:05.949654 |       File "/home/jenkins/workspace/gate-networking-onos-python27-ubuntu-xenial/.tox/py27/local/lib/python2.7/site-packages/sqlalchemy/engine/default.py", line 470, in do_execute
2017-08-10 00:51:05.949675 |         cursor.execute(statement, parameters)
2017-08-10 00:51:05.949702 |     InterfaceError: Error binding parameter 0 - probably unsupported type.
2017-08-10 00:51:05.949728 |        ERROR [neutron.api.v2.resource] delete failed: No details.