replace netifaces with pyroute2

[eshattow]

replace netifaces with pyroute2

[eshattow]

I've gutted the testing coverage because I'm not a python programmer and have no idea how to write the tests. That's the best I know how to do. Let me know what the tests should be and I'll add them w/ co-authored tag and all that, I just have this as a blocker for some other project which uses greeclimate but netifaces is unfixable and unmaintained.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 92.72%. Comparing base (cff93f8) to head (d43314c).

Files with missing lines	Patch %	Lines
greeclimate/discovery.py	0.00%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #150      +/-   ##
==========================================
- Coverage   95.65%   92.72%   -2.94%     
==========================================
  Files           8        8              
  Lines         760      756       -4     
==========================================
- Hits          727      701      -26     
- Misses         33       55      +22     

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