testValidateBondingOptions: declare root requirement

Our Bond.validateOptions() and and its test require root permissions.

Change-Id: I43743e2446d014ae1e4e97b84756dc403019c455
Signed-off-by: Dan Kenigsberg <danken@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/20284
Reviewed-by: Antoni Segura Puimedon <asegurap@redhat.com>
Reviewed-by: Miguel Angel Ajo Pelayo <miguelangel@ajo.es>