Reduce python APIv2 test net dependency

Previously these tests pulled some test images from quay, opening them up
to networking-flake induced failures.  As has already been done for
other tests, update to utilize the locally running registry server.

Also: Add `test/python/**` into the apiv2 task conditions as referenced
by the `Makefile` `localapiv2-python` target.

Signed-off-by: Chris Evich <cevich@redhat.com>