Extra temp hash empty dir appears in `SSHContext` remote

[LavendaRaphael]

I found that when I use SSHContext, after running dpdispatcher, 2 hash directories appear in the remote directory:

• One is empty.
• The other is the working directory,

I found out that the problem is

• When dpdispatcher initializes a Submission instance, it creates the first useless directory
  

  dpdispatcher/dpdispatcher/submission.py

  Line 56 in 793a7d5

  self.bind_machine(machine)

  
  

  dpdispatcher/dpdispatcher/ssh_context.py

  Line 289 in 793a7d5

  sftp.mkdir(self.remote_root)

• Then create the real working directory after Submission.run_submission
  

  dpdispatcher/dpdispatcher/submission.py

  Line 169 in 793a7d5

  self.generate_jobs()

  
  

  dpdispatcher/dpdispatcher/submission.py

  Line 330 in 793a7d5

  self.bind_machine(self.machine)

[njzjz]

Fixed by #261.

[LavendaRaphael]

Fixed by #261.

The modification resolves the issue in case of a run without interruption.
But for the old submission case, the empty directory appeared again.

dpdispatcher/dpdispatcher/submission.py

Lines 372 to 389 in 5785a78

	def try_recover_from_json(self):
	submission_file_name = "{submission_hash}.json".format(submission_hash=self.submission_hash)
	if_recover = self.machine.context.check_file_exists(submission_file_name)
	submission = None
	submission_dict = {}
	if if_recover :
	submission_dict_str = self.machine.context.read_file(fname=submission_file_name)
	submission_dict = json.loads(submission_dict_str)
	submission = Submission.deserialize(submission_dict=submission_dict)
	submission.bind_machine(machine=self.machine)
	if self == submission:
	self.belonging_jobs = submission.belonging_jobs
	self.bind_machine(machine=self.machine)
	dlog.info(f"Find old submission; recover submission from json file;"
	f"submission.submission_hash:{submission.submission_hash}; "
	f"machine.context.remote_root:{self.machine.context.remote_root}; "
	f"submission.work_base:{submission.work_base};")
	# self = submission.bind_machine(machine=self.machine)

[njzjz]

Fixed in #346.