separated from the apiserver running locally on the master node so that it
can be optionally enabled or disabled as needed.
Also, fix the healthchecking configuration for the master components, which
was previously only working by coincidence:
If a kubelet doesn't register with a master, it never bothers to figure out
what its local address is. In which case it ends up constructing a URL like
http://:8080/healthz for the http probe. This happens to work on the master
because all of the pods are using host networking and explicitly binding to
127.0.0.1. Once the kubelet is registered with the master and it determines
the local node address, it tries to healthcheck on an address where the pod
isn't listening and the kubelet periodically restarts each master component
when the liveness probe fails.
Docker's v1 registry has gotten slower and slower, and they have no
interest in fixing it. Using a mirror forces v1 mode. Measurements
show that v1 with our mirror is slower than v2 with docker's registry in
just about all metrics.
* Set SHA1 for Kubernetes server binary and Salt tar in kube-env.
* Check SHA1 in configure-vm.sh. If the env variable isn't available,
download the SHA1 from GCS and double check that.
* Fixes a bug in the devel path where we were actually uploading the
wrong sha1 to the bucket.
Fixes#10021
