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2) seed RT if empty before starting bootstrap incase 1 hasn't fired
3) pass bootstrap config as option while creating Dht
4) replace all bootstrap function with 1 function

Implement striped locking for datastore puts.

We usually _explicitly_ call connect before calling `prep` but we may disconnect
somewhere in-between. We _don't_ want to get stuck here dialing if the context
has been canceled.

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

fixes #276

This reverts commit 7e68ac3c.

* Rework TestFindPeersQuery

Unravel the logic and create a minimal test case that isn't flaky.

* Use testing.T.Logf

* Skip the original test in short mode

* Add comments for the arguments to testFindPeerQuery

* Qualify aberrant package name

* Use redundant package names

* gx import testify 1.3.0.

* 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.

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.