fix: usr: #271: Change config names to start with rubix

[codecov-io]

Codecov Report

Merging #272 into master will decrease coverage by 0.03%. The diff coverage is 0%.

@@            Coverage Diff             @@
##           master     #272      +/-   ##
==========================================
- Coverage   50.45%   50.41%   -0.04%     
==========================================
  Files          60       60              
  Lines        2993     3015      +22     
  Branches      325      326       +1     
==========================================
+ Hits         1510     1520      +10     
- Misses       1393     1408      +15     
+ Partials       90       87       -3

Impacted Files	Coverage Δ
...main/java/com/qubole/rubix/spi/ClusterManager.java	0% <0%> (ø)	:arrow_up:
...rc/main/java/com/qubole/rubix/spi/CacheConfig.java	20.52% <0%> (-0.85%)	:arrow_down:
.../qubole/rubix/hadoop2/Hadoop2ClusterManagerV2.java	47.36% <0%> (-5.27%)	:arrow_down:
.../java/com/qubole/rubix/core/CachingFileSystem.java	34.57% <0%> (-0.33%)	:arrow_down:
...in/java/com/qubole/rubix/common/utils/DataGen.java	0% <0%> (ø)	:arrow_up:
...n/java/com/qubole/rubix/bookkeeper/BookKeeper.java	70.89% <0%> (+0.61%)	:arrow_up:
...a/com/qubole/rubix/bookkeeper/utils/DiskUtils.java	60.97% <0%> (+10.97%)	:arrow_up: