Right now, our doc generation scripts notice if you make changes and
don't regen docs, don't include new docs, etc. But they miss it if your
changes should have REMOVED a doc. Both kubectl-apiversion and
kubectl-clusterinfo should have been removed, but weren't.
This patch starts tracking all generated doc files and will cause
problems if files should be removed and aren't.
* Rewrite a bunch of the hack/ directory with modular reusable bash libraries.
* Have 'build/*' build on 'hack/*'. The stuff in build now just runs hack/* in a docker container.
* Use a docker data container to enable faster incremental builds.
* Standardize output to _output/{local,dockerized}/bin/OS/ARCH/*. This regularized placement makes cross compilation work.
* Move travis specific scripts under hack/travis
With new dockerized incremental builds, I can do a no-op `make quick-release` in ~30s. This is a significant improvement.
Daniel Smith