Add eventlet_backdoor and threadgroup from openstack-common
Add eventlet_backdoor and threadgroup from openstack-common

In addition to this the list of imports is now in an alphabetical order.

Change-Id: I34517ce3f740f63094d21b3cbebb542cc40661a2

cisco-openstack/networking-cisco,Tehsmash/networking-cisco,nikolay-fedotov/networking-cisco,CiscoSystems/networking-cisco,openstack/networking-cisco,noironetworks/networking-cisco,Gitweijie/first_project,Tehsmash/networking-cisco,CiscoSystems/networking-cisco,cisco-openstack/networking-cisco,Gitweijie/first_project,openstack/networking-cisco,Tehsmash/networking-cisco-nexus,Tehsmash/networking-cisco-apic,noironetworks/networking-cisco,hareeshpc/networking-cisco,hareeshpc/networking-cisco