Cleanup setup.py test target to handle missing py.test
Cleanup setup.py test target to handle missing py.test

Signed-off-by: Chris Lalancette <281cd07d7578d97c83271fbbf2faddb83ab3791c@gmail.com>

cernops/oz,NeilBryant/oz,ndonegan/oz,imcleod/oz,clalancette/oz,clalancette/oz,ndonegan/oz,cernops/oz,NeilBryant/oz,nullr0ute/oz,moofrank/oz,nullr0ute/oz,imcleod/oz,mgagne/oz,mgagne/oz,moofrank/oz