New allows a user of the client library to get its implementation.

RegisterFactory allows a client implementation to register itself.

RunCommandAndWait executes a single command on a given vtctld and blocks until the command did return or timed out.

UnregisterFactoryForTest allows to unregister a client implementation from the static map.

VtctlClient defines the interface used to send remote vtctl commands.

Factory functions are registered by client implementations.