IPv6 support

[hjltu]

add: all addresses support for client,
ipv6 option for callhome.

[JennToo]

Thanks for the contribution!

There are just a few minor changes. If you prefer, I can also make them myself after merging this PR. Just let me know!

[codecov-io]

Codecov Report

Merging #9 (68912df) into master (b776e6f) will decrease coverage by 3.18%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master       #9      +/-   ##
==========================================
- Coverage   82.11%   78.92%   -3.19%     
==========================================
  Files           8        8              
  Lines         559      579      +20     
  Branches       63       66       +3     
==========================================
- Hits          459      457       -2     
- Misses         79      101      +22     
  Partials       21       21              

Impacted Files	Coverage Δ
netconf_client/connect.py	0.00% <0.00%> (ø)
netconf_client/ncclient.py	99.44% <0.00%> (-0.01%)	⬇️

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[hjltu]

OK, you can merge it now, it's all your :)

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 0% with 30 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.92%. Comparing base (b776e6f) to head (68912df).
⚠️ Report is 46 commits behind head on main.

Files with missing lines	Patch %	Lines
netconf_client/connect.py	0.00%	30 Missing ⚠️
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Additional details and impacted files

@@            Coverage Diff             @@
##             main       #9      +/-   ##
==========================================
- Coverage   82.11%   78.92%   -3.19%     
==========================================
  Files           8        8              
  Lines         559      579      +20     
  Branches       63       66       +3     
==========================================
- Hits          459      457       -2     
- Misses         79      101      +22     
  Partials       21       21              

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