Fix read file in jar 20190402 dq

[dqing0]

Describe what this PR does / why we need it

Does this pull request fix one issue?

Fixes #634

Describe how you did it

1.参考FileRefreshableDataSource实现专门读取jar文件的方法
2.通过jdk的JarFile,和jarEntry读取jar包中的文件

Describe how to verify it

1.运行JarFileDataSourceDemo方法

[codecov-io]

Codecov Report

Merging #646 into master will decrease coverage by 0.02%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #646      +/-   ##
============================================
- Coverage     40.49%   40.47%   -0.03%     
+ Complexity     1187     1186       -1     
============================================
  Files           267      267              
  Lines          7845     7845              
  Branches       1061     1061              
============================================
- Hits           3177     3175       -2     
- Misses         4272     4274       +2     
  Partials        396      396

Impacted Files	Coverage Δ	Complexity Δ
...s/block/flow/controller/RateLimiterController.java	79.31% <0%> (-10.35%)	7% <0%> (-1%)
...l/cluster/server/connection/ConnectionManager.java	76% <0%> (+2%)	11% <0%> (+1%)	⬆️

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[sczyh30]

Thanks for contributing!