Comment 10 for bug 1533013

2017-03-27 11:31:23.510 58098 ERROR neutron.plugins.ml2.managers [req-f0bcecc8-caff-44fa-9866-c41bda521983 945856473cb34ca787b2cb20fb6a4f66 d311f5cb5d0c403c97e5654360d14ada - - -] Mechanism driver 'l2population' failed in delete_port_postcommit
2017-03-27 11:31:23.510 58098 ERROR neutron.plugins.ml2.managers Traceback (most recent call last):
2017-03-27 11:31:23.510 58098 ERROR neutron.plugins.ml2.managers File "/usr/lib/python2.7/site-packages/neutron/plugins/ml2/managers.py", line 433, in _call_on_drivers
2017-03-27 11:31:23.510 58098 ERROR neutron.plugins.ml2.managers getattr(driver.obj, method_name)(context)
2017-03-27 11:31:23.510 58098 ERROR neutron.plugins.ml2.managers File "/usr/lib/python2.7/site-packages/neutron/plugins/ml2/drivers/l2pop/mech_driver.py", line 74, in delete_port_postcommit
2017-03-27 11:31:23.510 58098 ERROR neutron.plugins.ml2.managers port, agent_host)
2017-03-27 11:31:23.510 58098 ERROR neutron.plugins.ml2.managers File "/usr/lib/python2.7/site-packages/neutron/plugins/ml2/drivers/l2pop/mech_driver.py", line 312, in _get_agent_fdb
2017-03-27 11:31:23.510 58098 ERROR neutron.plugins.ml2.managers if not self._validate_segment(segment, port['id'], agent):
2017-03-27 11:31:23.510 58098 ERROR neutron.plugins.ml2.managers File "/usr/lib/python2.7/site-packages/neutron/plugins/ml2/drivers/l2pop/mech_driver.py", line 190, in _validate_segment
2017-03-27 11:31:23.510 58098 ERROR neutron.plugins.ml2.managers network_types = l2pop_db.get_agent_l2pop_network_types(agent)
2017-03-27 11:31:23.510 58098 ERROR neutron.plugins.ml2.managers File "/usr/lib/python2.7/site-packages/neutron/plugins/ml2/drivers/l2pop/db.py", line 52, in get_agent_l2pop_network_types
2017-03-27 11:31:23.510 58098 ERROR neutron.plugins.ml2.managers configuration = jsonutils.loads(agent.configurations)
2017-03-27 11:31:23.510 58098 ERROR neutron.plugins.ml2.managers AttributeError: 'NoneType' object has no attribute 'configurations'
2017-03-27 11:31:23.510 58098 ERROR neutron.plugins.ml2.managers
2017-03-27 11:31:23.511 58098 DEBUG networking_generic_switch.generic_switch_mech [req-f0bcecc8-caff-44fa-9866-c41bda521983 945856473cb34ca787b2cb20fb6a4f66 d311f5cb5d0c403c97e5654360d14ada - - -] Deleting port GigabitEthernet0/0/8 on sw-hostname from vlan: 2005 delete_port_postcommit /usr/lib/python2.7/site-packages/networking_generic_switch/generic_switch_mech.py:361