'Tell each host to ping the next one.'

def ping(self):

    consoles = self.consoles['hosts'].consoles
    if self.waiting(consoles):
        return
    count = len(consoles)
    i = 0
    for console in consoles:
        i = ((i + 1) % count)
        ip = consoles[i].node.IP()
        console.sendCmd(('ping    ' + ip))
