Improve python interpreter check
Improve python interpreter check

Makes the python interepreter check more future compatible to prepare
for Ubuntu 20.04

roots/bedrock-ansible,newtonne/trellis,pressbooks/trellis,roots/trellis,newtonne/trellis,buluma/trellis,roots/bedrock-ansible,roots/trellis,buluma/trellis,pressbooks/trellis,newtonne/trellis,buluma/trellis,buluma/trellis