b9a5a5c9b3
Automatic merge from submit-queue (batch tested with PRs 43866, 42748) hack/cluster: download cfssl if not present hack/local-up-cluster.sh uses cfssl to generate certificates and will exit it cfssl is not already installed. But other cluster-up mechanisms (GCE) that generate certs just download cfssl if not present. Make local-up-cluster.sh do that too so users don't have to bother installing it from somewhere.
This staging/src/k8s.io/client-go directory is the staging area of the client repo. It contains a versioned client, tools built around the client like the reflector, and all the client dependencies. The content will be periodically published to k8s.io/client-go repo.
The staged content is copied from the main repo, i.e., k8s.io/kubernetes, with directory rearrangement and necessary rewritings. To sync the content with the latest code in your local k8s.io/kubernetes, you need to run godep restore in k8s root directory, then run staging/copy.sh.
vendor/k8s.io/client-go is a symlink pointing to this staging area, so to use the packages in the staging area, you can import it as "vendor/client-go/", as if the client were vendored. The client will be vendored from k8s.io/client-go for real after the test matrix is converted to vendor k8s components.