More explicit octal values (pep-3127)

Change 0XXX to 0oXXX so that that these values are more visibly octal
and forwards compatible with Python 3.3+.

This change follows the spirit of:
http://www.python.org/dev/peps/pep-3127/

"The default octal representation of integers is silently confusing to people
unfamiliar with C-like languages. It is extremely easy to inadvertently create
an integer object with the wrong value, because '013' means 'decimal 11', not
'decimal 13', to the Python language itself, which is not the meaning that most
humans would assign to this literal."

Change-Id: Icc81c0ac52cc779511e49133aa669defeb47a3f1
Signed-off-by: Antoni S. Puimedon <asegurap@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/20534
Reviewed-by: Dan Kenigsberg <danken@redhat.com>