'Set the IP address for an interface.
intf: intf or intf name
ip: IP address as a string
prefixLen: prefix length, e.g. 8 for /8 or 16M addrs
kwargs: any additional arguments for intf.setIP'

def setIP(self, ip, prefixLen=8, intf=None, **kwargs):

    return self.intf(intf).setIP(ip, prefixLen, **kwargs)
