Improve the readability of define.py

Maintain pep8 compatibility but improve the readability by
recovering some space (reducing indentation).

Change-Id: If7649694b2dd215ae0c3279c61c1c6a3a86e5178
Signed-off-by: Antoni S. Puimedon <asegurap@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/12514
Reviewed-by: Federico Simoncelli <fsimonce@redhat.com>
Reviewed-by: Dan Kenigsberg <danken@redhat.com>