添加Doh,DohJson,IPV6支持

[ag2s20150909]

#35

DoH JSON API

https://dns.google/resolve?
https://dns.alidns.com/resolve?
https://doh.pub/dns-query?
https://doh.360.cn/resolve?

Dns over https(RFC8484)

https://dns.google/dns-query
https://dns.alidns.com/dns-query
https://doh.pub/dns-query
https://doh.360.cn/dns-query

[codecov]

Codecov Report

Merging #36 (a8e980a) into master (452393b) will increase coverage by 4.97%.
The diff coverage is 86.86%.

@@             Coverage Diff              @@
##             master      #36      +/-   ##
============================================
+ Coverage     48.50%   53.47%   +4.97%     
- Complexity      123      151      +28     
============================================
  Files            23       25       +2     
  Lines           800      907     +107     
  Branches        153      165      +12     
============================================
+ Hits            388      485      +97     
- Misses          347      351       +4     
- Partials         65       71       +6     

Impacted Files	Coverage Δ
...a/com/qiniu/android/dns/http/DnspodEnterprise.java	0.00% <0.00%> (ø)
...c/main/java/com/qiniu/android/dns/local/Hosts.java	83.33% <0.00%> (ø)
...rc/main/java/com/qiniu/android/dns/DnsManager.java	56.36% <66.66%> (-0.27%)	⬇️
...ry/src/main/java/com/qiniu/android/dns/Record.java	65.00% <75.00%> (+1.84%)	⬆️
...c/main/java/com/qiniu/android/dns/http/DohDns.java	86.66% <86.66%> (ø)
.../main/java/com/qiniu/android/dns/http/DohJson.java	87.75% <87.75%> (ø)
.../com/qiniu/android/dns/local/AndroidDnsServer.java	37.00% <100.00%> (ø)
...n/java/com/qiniu/android/dns/local/DnsMessage.java	83.96% <100.00%> (+0.46%)	⬆️
...ain/java/com/qiniu/android/dns/local/Resolver.java	92.10% <100.00%> (+3.64%)	⬆️
... and 1 more

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