Automatic merge from submit-queue (batch tested with PRs 46782, 46719, 46339, 46609, 46494)

Support custom domains in the cockroachdb example's init container

This switches from using v0.1 of the peer-finder image to a version that
includes https://github.com/kubernetes/contrib/pull/2013

While I'm here, switch the version of cockroachdb from 1.0 to 1.0.1

```release-note
NONE
```

@tschottdorf