Test AckMcastSenderWindow
testAck():
1. Create two messages {1,2} each with 3 distinct destinations.
2. Start a thread that acknowledges messages between sleeping
intervals.
3. When the callback retransmission function is called, check that the
request is for a destination that is still associated with the given
message sequence number.
Since AckMcastSenderWindow does not export its state, keep
track of seqnos and address lists in a hashtable.
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