This patch rehomes the neutron core resource API
definitions and includes UTs + reno.
In addition a minor base API def test case change is included
to support attribute maps that don't define the 'default'.
Co-Authored-By: Henry Gessau <HenryG@gessau.net>
Change-Id: I549bd94852395c62b5c73fb3c9681206d734e559