Move RCA files to subdir owned by elasticsearch user

[peterzhuamazon]

Issue #, if available:
opendistro-for-elasticsearch/opendistro-build#34
opendistro-for-elasticsearch/opendistro-build#320

Description of changes:
Move RCA files to subdir owned by elasticsearch user

Tests:
image

Code coverage percentage for this patch:

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov]

Codecov Report

Merging #271 into master will decrease coverage by 0.05%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #271      +/-   ##
============================================
- Coverage     66.33%   66.28%   -0.06%     
+ Complexity     1795     1793       -2     
============================================
  Files           270      270              
  Lines         11990    11990              
  Branches        952      952              
============================================
- Hits           7953     7947       -6     
- Misses         3722     3726       +4     
- Partials        315      317       +2     

Impacted Files	Coverage Δ	Complexity Δ
...asticsearch/performanceanalyzer/net/NetClient.java	67.24% <0.00%> (-8.63%)	10.00% <0.00%> (-1.00%)
...nalyzer/rca/net/handler/PublishRequestHandler.java	67.50% <0.00%> (-5.00%)	5.00% <0.00%> (ø%)
...csearch/performanceanalyzer/rca/RcaController.java	81.25% <0.00%> (-0.63%)	35.00% <0.00%> (-1.00%)
...o/elasticsearch/performanceanalyzer/core/Util.java	70.83% <0.00%> (+8.33%)	5.00% <0.00%> (ø%)

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[ktkrg]

Thanks for the contribution, changes lgtm.
🚢 it!