Adding requires to python-argparse

Change-Id: Icf5ae4df4935969a1de87cfc66544da7a3ef3ca5
Signed-off-by: Yaniv Bronhaim <ybronhei@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/18809
Reviewed-by: Alon Bar-Lev <alonbl@redhat.com>
Reviewed-by: Dan Kenigsberg <danken@redhat.com>