Makefile: add whitelist files to pyflakes and pep8 check

We should run pyflakes and pep8 check in vdsm-reg-setup.in for example.
We already have whitelist for pep8. this adds the files also to pyflakes
check.

Change-Id: I6be99965f3249374c99c1d4ab71145d571c13921
Signed-off-by: Douglas Schilling Landgraf <dougsland@redhat.com>
Signed-off-by: Yaniv Bronhaim <ybronhei@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/27025
Reviewed-by: Dan Kenigsberg <danken@redhat.com>