Add org and project params to run-tox.

These are ignored for now, but the github org will be used in
a subsequent change to determine which pypi mirror to use.

The project parameter may eventually be useful for allowing
special behavior for openstack/requirements, so go ahead and
include it here for completeness.

Change-Id: I31f235df100622ea26420c81404b16f24b05be01
Reviewed-on: https://review.openstack.org/23512
Reviewed-by: Monty Taylor <mordred@inaugust.com>
Approved: Jeremy Stanley <fungi@yuggoth.org>
Reviewed-by: Jeremy Stanley <fungi@yuggoth.org>
Tested-by: Jenkins