Automatic merge from submit-queue (batch tested with PRs 62495, 63003, 62829, 62151, 62002). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

Build cleanup with go 1.10

Simplify our build/test scripts now that go 1.10 is in play.  It has caching that seems to actually work.

**Release note**:
```release-note
NONE
```