Rally test. Error messages at DVS agent log for some tests.

[Vyacheslav Tabolin]

Error messages at dvs agent log files for resize_server and snapshot_server tests:

2016-06-09 17:59:19.981 27147 ERROR neutron Traceback (most recent call last):
2016-06-09 17:59:19.981 27147 ERROR neutron File "/usr/bin/neutron-dvs-agent", line 10, in <module>
2016-06-09 17:59:19.981 27147 ERROR neutron sys.exit(main())
2016-06-09 17:59:19.981 27147 ERROR neutron File "/usr/lib/python2.7/dist-packages/neutron/cmd/eventlet/plugins/dvs_neutron_agent.py", line 22, in main
2016-06-09 17:59:19.981 27147 ERROR neutron agent_main.main()
2016-06-09 17:59:19.981 27147 ERROR neutron File "/usr/lib/python2.7/dist-packages/neutron/plugins/ml2/drivers/vmware_dvs/agent/dvs_neutron_agent.py", line 431, in main
2016-06-09 17:59:19.981 27147 ERROR neutron agent.daemon_loop()
2016-06-09 17:59:19.981 27147 ERROR neutron File "/usr/lib/python2.7/dist-packages/neutron/plugins/ml2/drivers/vmware_dvs/agent/dvs_neutron_agent.py", line 297, in daemon_loop
2016-06-09 17:59:19.981 27147 ERROR neutron self.rpc_loop(polling_manager=pm)
2016-06-09 17:59:19.981 27147 ERROR neutron File "/usr/lib/python2.7/dist-packages/neutron/plugins/ml2/drivers/vmware_dvs/agent/dvs_neutron_agent.py", line 318, in rpc_loop
2016-06-09 17:59:19.981 27147 ERROR neutron self.process_ports()
2016-06-09 17:59:19.981 27147 ERROR neutron File "/usr/lib/python2.7/dist-packages/neutron/plugins/ml2/drivers/vmware_dvs/agent/dvs_neutron_agent.py", line 351, in process_ports
2016-06-09 17:59:19.981 27147 ERROR neutron self.sg_agent.remove_devices_filter(deleted_ports)
2016-06-09 17:59:19.981 27147 ERROR neutron File "/usr/lib/python2.7/dist-packages/vmware_dvs/agent/firewalls/dvs_securitygroup_rpc.py", line 54, in remove_devices_filter
2016-06-09 17:59:19.981 27147 ERROR neutron self.firewall.remove_port_filter(device_ids)
2016-06-09 17:59:19.981 27147 ERROR neutron File "/usr/lib/python2.7/dist-packages/vmware_dvs/agent/firewalls/vcenter_firewall.py", line 236, in remove_port_filter
2016-06-09 17:59:19.981 27147 ERROR neutron self.dvs_ports.pop(port['device'], None)
2016-06-09 17:59:19.981 27147 ERROR neutron TypeError: 'NoneType' object has no attribute '__getitem__'
2016-06-09 17:59:19.981 27147 ERROR neutron

[Vyacheslav Tabolin (slavchick)]

Commited https://github.com/Mirantis/vmware-dvs/commit/51b16577a57f3f1707abd0c8b3