pep8: use multiline blacklist

Change-Id: I8e9f4d214ae2bf19029265d230078cf5f67d9e15
Signed-off-by: Dan Kenigsberg <danken@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/25416
Reviewed-by: Yaniv Bronhaim <ybronhei@redhat.com>