public void visitAll(ExecutionCommand command) {
    for (ExecutionCommandVisitor visitor : m_visitors) {
      visitor.visit(command);
    }
  }
Called as a way to post-process the command after it has been created and various objects
have been set.

@param command the command
ambari-server/src/main/java/org/apache/ambari/server/controller/ActionExecutionContext.java