Return jobdir for started async jobs

[dsavchenko]

No description provided.

[codecov-commenter]

Codecov Report

Attention: 24 lines in your changes are missing coverage. Please review.

Comparison is base (a9ba65c) 20.43% compared to head (650d155) 20.46%.
Report is 6 commits behind head on master.

Files	Patch %	Lines
nb2workflow/nbadapter.py	0.00%	11 Missing ⚠️
nb2workflow/service.py	0.00%	11 Missing ⚠️
nb2workflow/deploy.py	0.00%	1 Missing ⚠️
nb2workflow/workflows.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #131      +/-   ##
==========================================
+ Coverage   20.43%   20.46%   +0.02%     
==========================================
  Files          31       31              
  Lines        2682     2693      +11     
==========================================
+ Hits          548      551       +3     
- Misses       2134     2142       +8     

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[volodymyrss]

Maybe it can be refactored to create tmp directory differently, using the key, but for now it's ok, thanks!