remove temp hash empty dir when recovered

[njzjz]

Fix #177.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.36 🎉

Comparison is base (75e2764) 62.17% compared to head (3e1efc8) 62.53%.

❗ Current head 3e1efc8 differs from pull request most recent head 753c276. Consider uploading reports for the commit 753c276 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #346      +/-   ##
==========================================
+ Coverage   62.17%   62.53%   +0.36%     
==========================================
  Files          27       27              
  Lines        2937     2939       +2     
==========================================
+ Hits         1826     1838      +12     
+ Misses       1111     1101      -10     

Impacted Files	Coverage Δ
dpdispatcher/ssh_context.py	81.19% <100.00%> (+0.08%)	⬆️

... and 2 files with indirect coverage changes

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