redis migration test

cluster = RedisCluster(nodes)
slotA = 0
slotB = 9999
A = cluster.node_by_slot(slotA)
B = cluster.node_by_slot(slotB)
if A is B:
    raise Exception('A and B are equal')
while True:
    cluster.migrate(slotA, A.id, B.id)
    cluster.migrate(slotB, B.id, A.id)
    A, B = B, A