Henry Gessau 37487161bd Use ExtensionDescriptor from neutron-lib
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
2016-11-28 01:30:38 -08:00
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