code: public final boolean start() {
  
          if (running || booting || stopping || terminated) {
              // do nothing if this instance is not stopped
              return false;
          } else {
              // mark this instance started
              booting = true;
              running = true;
  
              onStarted();
  
              return true;
          }
      }
docs: Start a stopped mock ec2 instance.
  
  @return true for successfully started and false for nothing changed by this action