[#310] CachedQuotas.analyze creates unnecessary HashSets

[pjeli]

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GitHub Issue

Fixes #310

Checklist:

• This pull request updates the documentation
• This pull request changes the code
• Title of the PR is of format (example) : [#25] Add Pull Request Template, where [#25] is the GitHub issue number

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• My commits all reference GH issues in their subject lines, and I have squashed multiple commits if they address the same issue. In addition, my commits follow the guidelines from "How to write a good git commit message":
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[codecov]

Codecov Report

Merging #313 (b8c99e9) into master (ea294f9) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #313      +/-   ##
============================================
+ Coverage     74.31%   74.34%   +0.02%     
- Complexity     1075     1076       +1     
============================================
  Files            56       56              
  Lines          7083     7082       -1     
  Branches        638      638              
============================================
+ Hits           5264     5265       +1     
+ Misses         1423     1422       -1     
+ Partials        396      395       -1     

Impacted Files	Coverage Δ
...adoop/hdfs/server/namenode/cache/CachedQuotas.java	86.13% <100.00%> (-0.14%)	⬇️
...menode/analytics/web/NamenodeAnalyticsMethods.java	68.87% <0.00%> (+0.15%)	⬆️

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