UC Query Add SingleFlight & connect check

[YangSen-qn]

No description provided.

[codecov]

Codecov Report

Merging #449 (bfd32f0) into master (cb40f3b) will increase coverage by 0.44%.
The diff coverage is 79.45%.

@@             Coverage Diff              @@
##             master     #449      +/-   ##
============================================
+ Coverage     72.32%   72.76%   +0.44%     
- Complexity      987     1007      +20     
============================================
  Files            80       82       +2     
  Lines          5160     5328     +168     
  Branches        766      791      +25     
============================================
+ Hits           3732     3877     +145     
- Misses          900      910      +10     
- Partials        528      541      +13     

Impacted Files	Coverage Δ	Complexity Δ
.../main/java/com/qiniu/android/common/Constants.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
...main/java/com/qiniu/android/http/ResponseInfo.java	63.41% <0.00%> (ø)	42.00 <1.00> (ø)
...n/java/com/qiniu/android/http/request/Request.java	78.57% <ø> (ø)	8.00 <0.00> (ø)
.../qiniu/android/http/request/HttpSingleRequest.java	87.27% <60.00%> (-1.30%)	11.00 <2.00> (+2.00)	⬇️
...ain/java/com/qiniu/android/utils/SingleFlight.java	71.62% <71.62%> (ø)	4.00 <4.00> (?)
...c/main/java/com/qiniu/android/common/AutoZone.java	76.82% <73.33%> (+3.39%)	13.00 <1.00> (+1.00)
...iniu/android/http/connectCheck/ConnectChecker.java	91.17% <91.17%> (ø)	6.00 <6.00> (?)
.../qiniu/android/http/metrics/UploadTaskMetrics.java	83.72% <100.00%> (ø)	13.00 <0.00> (ø)
...roid/http/request/httpclient/SystemHttpClient.java	78.57% <100.00%> (+1.35%)	30.00 <0.00> (+3.00)
...com/qiniu/android/storage/GlobalConfiguration.java	100.00% <100.00%> (ø)	3.00 <0.00> (ø)
... and 5 more