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Queries previously would sometimes only query three (alpha value) peers
before halting the operation. This PR changes the number of peers
grabbed from the routing table to start a query to K.

Dht nodes would also not respond with enough peers, as per the kademlia
paper, this has been changed to from 4 to 'K'.

The query mechanism itself also was flawed in that it would pull all the
peers it had yet to query out of the queue and 'start' the query for
them. The concurrency rate limiting was done inside the 'queryPeer'
method after the goroutine was spawned. This did not allow for peers
receiver from query replies to be properly queried in order of distance.

License: MIT
Signed-off-by: Jeromy <jeromyj@gmail.com>