Clean up construct configuration for nibe gw

[elupus]

This reduces the nesting depth and make the logged output from a parsed block more readable.

[codecov]

Codecov Report

Attention: Patch coverage is 88.46154% with 3 lines in your changes missing coverage. Please review.

Project coverage is 58.65%. Comparing base (5c1eba7) to head (2195a07).
Report is 6 commits behind head on master.

Files with missing lines	Patch %	Lines
nibe/console_scripts/cli.py	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #179      +/-   ##
==========================================
+ Coverage   57.84%   58.65%   +0.80%     
==========================================
  Files          14       14              
  Lines        1274     1289      +15     
==========================================
+ Hits          737      756      +19     
+ Misses        537      533       -4     

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