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It's impossible to find the self ID in the DHT because of this statement https://github.com/libp2p/go-libp2p-kad-dht/blob/ac6772539b80d687c8ed711024b104aaa881c1d6/handlers.go#L257
So maybe we should ignore the "not found" error in this case, like we do it for the random walk.

* Add IpfsDHT.{Bootstrap{Random,Self},Peer{Id,Key}}
* Include client mode tests, support for Ping, and uncruft setupDHTs
* Include xerrors in deps

* Remove signal bootstrapping

Remove IpfsDHT.BootstrapOnSignal.

* Type check expected interfaces on IpfsDHT

* Simplify the bootstrap logic

* Tidy up a few other things

* Include BootstrapOnce

* Add comment about duplicating sanity checks

* Use existing import naming convention

* Defer error wrapping until we need it

* Restore existing query count behaviour

Remove IpfsDHT.BootstrapOnSignal.

Remove IpfsDHT.BootstrapOnSignal.

Also contained in "dht.go" and prints twice in godoc.

This ensures that our neighbors learn about us so that other peers on the
network *looking* for us can actually find us.

Also:

* Remove dead, racy code.
* Set independent timeouts per bootstrap query.

fixes #147