GitLab

This is a -u=patch update

This was causing us to build up a bunch of background goroutines. Technically,
we should be resetting all these streams when the DHT stops. However, we don't
actually unregister stream handlers from the host so, really, nothing will
actually stop till the host stops. When it does, it'll kill all the streams
anyways.

Really deal with the deleted tag issue.

Deal with renamed tags.

Add initial set of metrics exposed via OpenCensus.

batches deletes

go-libp2p-peerstore now has a TempAddrTTL of 2 minutes

```
verifying github.com/ipfs/go-datastore@v0.0.1/go.mod: checksum mismatch
        downloaded: h1:bYmHO9fuKO1Ca7dpdDBWQl0mndy5b0HFqSJjGlNYtzs=
        go.sum:     h1:d4KVXhMt913cLBEI/PXAy6ko+W7e9AhyAKBGh803qeE=
```

```
verifying github.com/ipfs/go-datastore@v0.0.1: checksum mismatch
        downloaded: h1:u3lrOIBAhGS5prBa94V89LJNMWlEsO2+zgFlEGTl0E4=
        go.sum:     h1:AW/KZCScnBWlSb5JbnEnLKFWXL224LBEh/9KXXOrUms=
```

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

This reverts commit 7e68ac3c.

Fixes race conditions in the tests when using go modules.