new: dev: ISS-302: Added support for GoogleHadoopFileSystem

[kvankayala]

• To integrate with GS, we need to set hadoop conf: fs.gs.impl=com.qubole.rubix.hadoop2.CachingGoogleHadoopFileSystem

• Tested the changes on a qubole GCP cluster :

  • Files were getting downloaded as expected.
  • I was able to see the logs that the engine is using cached data.

[codecov-io]

Codecov Report

Merging #303 into master will decrease coverage by 0.3%. The diff coverage is 0%.

@@            Coverage Diff             @@
##           master     #303      +/-   ##
==========================================
- Coverage   50.12%   49.82%   -0.31%     
==========================================
  Files          64       66       +2     
  Lines        3154     3167      +13     
  Branches      351      351              
==========================================
- Hits         1581     1578       -3     
- Misses       1487     1502      +15     
- Partials       86       87       +1

Impacted Files	Coverage Δ
...ix/presto/CachingPrestoGoogleHadoopFileSystem.java	0% <0%> (ø)
...e/rubix/hadoop2/CachingGoogleHadoopFileSystem.java	0% <0%> (ø)
...ole/rubix/bookkeeper/validation/FileValidator.java	68.96% <0%> (-6.9%)	:arrow_down:
...n/java/com/qubole/rubix/bookkeeper/BookKeeper.java	70.48% <0%> (-0.35%)	:arrow_down: