Remove last vestiges of oslo-incubator
Remove last vestiges of oslo-incubator

This is a community goal for Ocata.  We're already not using any of
the code, but there are some other files and references left over.

Change-Id: Ibaca2750c685d2b016468c3993f988a2e18d9b88
Partial-Bug: #1639103

openstack/networking-odl,openstack/networking-odl,openstack/networking-odl