@Override
  public void start(CoprocessorEnvironment env) {
    conf = env.getConfiguration();
  }
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