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Remove IpfsDHT.BootstrapOnSignal.

Remove IpfsDHT.BootstrapOnSignal.

Addresses CR and ensures that we don't wait 10m for tests that should never take
more than 5s.

Instead of changing the existing constructors, add a new DHT constructor that
takes options (and add DHT options).

Note: this does mean that the DHT won't work with peer keys by default and that
the constructor signature changes. Given all the changes that'll come with the
libp2p refactor, I don't feel too bad about this.

1. We need to close the process to tear it down.
2. Closing the signal channel will cause the goprocess timer to fire repeatedly so let's not do that.
3. Don't leak a goroutine (the amplify one).

These aren't errors, don't log them as such.

First, we use Alpha instead of K as the number of peers we grab from the
routing table (as per the kademlia paper).

Second, we don't use a size limited set for the 'GetClosestPeers' query.
We're going to process more than K peers before we find the K closest
peers.

Third, Change GetClosestPeers to actually return the K Closest peers,
not a hodge podge of peers that it found on the way to finding the
closest peers.