Properly classify bond devices with no slaves
    
    Although initscripts only considers an interface to be a bond if it
    has slaves, there are times when setting up a bond, or testing, when a
    bond may not have any slaves (yet) but does have a BONDING_OPTS
    attribute. Previously in those situations netcf would identify the
    interface as a plain ethernet. This patch makes the check more
    inclusive - now any interface with slaves *or* with a BONDING_OPTS
    attribute is considered to be a bond.
    
    This patch was inspired by an earlier patch sent by Lubomir Rintel
    which looked for BONDING_OPTS *instead of* looking for slaves.