Imports of sharing-clusters command

PathSynopsis
flagPackage flag implements command-line flag parsing.
fmtPackage fmt implements formatted I/O with functions analogous to C's printf and scanf.
io/ioutilPackage ioutil implements some I/O utility functions.
k8s.io/kubernetes/pkg/api
k8s.io/kubernetes/pkg/apimachinery/registered
k8s.io/kubernetes/pkg/runtime
logPackage log implements a simple logging package.