Add GeoDomain to DNS Nameserver in JSONv5

[karelrooted]

Add geoDomain field for DNS's Nameserver in JSONv5 configuration file. This feature was available in the JSONv4 configuration format.

This pull request:

• Restore the ability to use geoDomain in DNS's Nameserver

Usage:

{
    "address": {
        "address": "8.8.8.8",
        "port": 53
    },
    "geoDomain": [
        {
            "code": "netflix"
        }
    ]
}

[codecov-commenter]

Codecov Report

Attention: 27 lines in your changes are missing coverage. Please review.

Comparison is base (8de2f27) 38.27% compared to head (dfab3c6) 38.24%.
Report is 4 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2711      +/-   ##
==========================================
- Coverage   38.27%   38.24%   -0.03%     
==========================================
  Files         637      637              
  Lines       38149    38176      +27     
==========================================
  Hits        14600    14600              
- Misses      21939    21965      +26     
- Partials     1610     1611       +1     

Files	Coverage Δ
core.go	33.33% <ø> (ø)
...ort/internet/request/roundtripper/httprt/httprt.go	1.36% <ø> (ø)
app/dns/config.pb.go	12.48% <0.00%> (-0.16%)	⬇️
app/dns/dns.go	59.54% <0.00%> (-3.91%)	⬇️

... and 2 files with indirect coverage changes

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[xiaokangwang]

I think it is in general fine. I just have one comment about a unused field in the change.

[xiaokangwang]

Thanks for your contribution. I think this pull request is ready to be merged.

[xiaokangwang]

This pull request have been merged. Please send a pull request to the document if you are willing and able.