The commands used by constraints need at least tox 2.0. Update to
reflect reality, which should help with local running of constraints
targets.
Change-Id: I356a9aa2aa7df33bb77bbf6a3dadec93d581d4d2
This is the latest version of tox.ini we are using for other windmill
projects.
Change-Id: Ica5dffc02ef69fc8881dd904447333c925b6e8ca
Signed-off-by: Paul Belanger <pabelanger@redhat.com>