repoman: Do not check for indirect inherits of deprecated eclasses

Complain only about deprecated eclasses that are inherited directly.
Checking indirectly inherited eclasses is pointless since the ebuild
maintainer can't really do anything about it --- it is up to
the maintainer of one of the directly inherited eclasses.
Merge branch 'repoman-no-indirect-inherits' into all-in-one
Merge branch 'all-in-one' into all-in-one-plus-setup.py