139 add error handling to DHT

[zupzup]

Some more prep work for the DHT part of #139, adding error handling to the dht client and dht setup and a few cleanup and refactoring steps in those parts.

[codecov]

Codecov Report

Attention: Patch coverage is 13.20755% with 322 lines in your changes missing coverage. Please review.

Project coverage is 39.48%. Comparing base (02df6f8) to head (287d910).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/dht/client.rs	0.00%	195 Missing ⚠️
src/dht/mod.rs	0.00%	55 Missing ⚠️
src/util/terminal.rs	0.00%	28 Missing ⚠️
src/persistence/bill.rs	0.00%	13 Missing ⚠️
src/service/bill_service.rs	0.00%	12 Missing ⚠️
src/main.rs	0.00%	8 Missing ⚠️
src/service/company_service.rs	89.09%	6 Missing ⚠️
src/service/contact_service.rs	0.00%	2 Missing ⚠️
src/service/identity_service.rs	0.00%	2 Missing ⚠️
src/web/handlers/bill.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #241      +/-   ##
==========================================
+ Coverage   39.14%   39.48%   +0.34%     
==========================================
  Files          54       54              
  Lines       10235    10232       -3     
==========================================
+ Hits         4006     4040      +34     
+ Misses       6229     6192      -37     

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[tompro]

awesome