network: unified configureLibvirtNetwork parameters

configureLibvirtNetwork() parameters in iproute2 and pyroute_two
configurators are changed to fit the ifcfg's ones which was introduced
in 122c03886c4f42aa8c563e429aa7f4a9a1eb5a5b.

Change-Id: Ia175edd5d9b6b98fa9c92f4beebd1ae0fef24518
Signed-off-by: Petr Horáček <phoracek@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/34198
Reviewed-by: Dan Kenigsberg <danken@redhat.com>