Make setup.py pep8 compliant

Change-Id: I7d935203a3fbb59d298f91daaef0a10ca3004d2f
Signed-off-by: Prashanth Pai <ppai@redhat.com>
Reviewed-on: http://review.gluster.org/6045
Reviewed-by: Luis Pabon <lpabon@redhat.com>
Tested-by: Luis Pabon <lpabon@redhat.com>