37487161bd
ExtensionDescriptor has been rehomed to neutron-lib and is being removed from neutron core. See https://review.openstack.org/398113 Depends-On: I5a111e0033e518e39b3042f047ee9eebba77a0d5 Change-Id: I0f8b11bebed9bbb06273c0f9257ec1916e0201ea