@Override
  public Iterable<Service> getServices() {
    return Collections.singletonList(this);
  }
Receives shell commands from the client and executes them blindly. Intended only for use by
{@link ChaosMonkey} via {@link CoprocClusterManager}
hbase-it/src/test/java/org/apache/hadoop/hbase/ShellExecEndpointCoprocessor.java