'Return OVS interface options for intf'

def intfOpts(self, intf):

    opts = ''
    if (not self.isOldOVS()):
        opts += ('    ofport_request=%s' % self.ports[intf])
        if isinstance(intf, OVSIntf):
            (intf1, intf2) = (intf.link.intf1, intf.link.intf2)
            peer = (intf1 if (intf1 != intf) else intf2)
            opts += ('    type=patch    options:peer=%s' % peer)
    return ('' if (not opts) else (('    --    set    Interface    %s' % intf) + opts))
