Horizon in Rocky 'fixed' recursive inheritance but this
in turn broke our use of overextends. As such we drop
overextends for Rocky onwards, but this means Adjutant-UI
from Rocky onwards only works with Horizon from Rocky onwards.
This also fixes issues with quota naming cleanup which was
changed in Horizon proper.
Change-Id: I60fa4e8e751bb62760830e37775c42b9900fb59c