Single source for DEBs and RPMs

[dims]

We have duplicate code in k/release and k/k for deb(s) and rpm(s).

The code in k/release is built using:

./jenkins.sh --kube-version 1.12.0 --distros xenial` (debs)
./docker-build.sh` (rpms)

The code in k/k is built using:

bazel build //build/debs 
bazel build //build/rpms

Note that the code in k/release can sign the debs and rpms, while the one in k/k doesn't (AFAICT).

Since k/k is versioned and k/release is not, we need to drop the code in k/release and stick to the one in k/k. More specifically we need to change our release process to build the stuff from k/k and push them to where ever we publish artifacts. So there's a lot more digging to be done

Related issue : kubernetes/release#631

/sig release

cc @tpepper @calebamiles @justaugustus

[mauilion]

To add on here. There are also a number of things that have changed in the k/k/build repo that are not present in the k/release/ repo.
Among them the handling of the sysctl.d and modules.conf.d files for the kubeadm package.

[timothysc]

closing in favor of #71677