add the ability to explicitely specify the dotfile key on import

[deadc0de6]

add the ability to explicitely specify the dotfile key on import with -K --dkey.

See #443

[codecov]

Codecov Report

Attention: Patch coverage is 93.33333% with 1 line in your changes missing coverage. Please review.

Project coverage is 90.87%. Comparing base (b53f939) to head (49ee6f2).
Report is 8 commits behind head on master.

Files with missing lines	Patch %	Lines
dotdrop/cfg_aggregator.py	92.30%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #452   +/-   ##
=======================================
  Coverage   90.87%   90.87%           
=======================================
  Files          23       23           
  Lines        4768     4780   +12     
=======================================
+ Hits         4333     4344   +11     
- Misses        435      436    +1     

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