JoinCluster performs all the necessary steps to join a cluster to the federation provided the required set of parameters are passed in.

NewCmdJoin defines the `join` command that joins a cluster to a federation.

NewCmdUnjoin defines the `unjoin` command that unjoins a cluster from a federation.

NewCmdVersion prints out the release version info for this command binary.

NewKubeFed2Command creates the `kubefed2` command and its nested children.

UnjoinCluster performs all the necessary steps to unjoin a cluster from the federation provided the required set of parameters are passed in.