code: public void startDockerMachine(String cliPathExec, String machineName) {
          commandLineExecutor.execCommand(createDockerMachineCommand(cliPathExec), "start", machineName);
          this.manuallyStarted = true;
      }
docs: Starts given docker machine.
  
  @param cliPathExec
  location of docker-machine or null if it is on PATH.
  @param machineName
  to be started.