[#61] Make NNA constructor that accepts configuration

[pjeli]

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GitHub Issue

Fixes #61

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 #76 into master will decrease coverage by 0.25%.
The diff coverage is 42.22%.

@@             Coverage Diff              @@
##             master      #76      +/-   ##
============================================
- Coverage      54.5%   54.25%   -0.26%     
+ Complexity      568      563       -5     
============================================
  Files            34       34              
  Lines          4216     4208       -8     
  Branches        402      399       -3     
============================================
- Hits           2298     2283      -15     
- Misses         1738     1747       +9     
+ Partials        180      178       -2

Impacted Files	Coverage Δ	Complexity Δ
...ava/com/paypal/security/SecurityConfiguration.java	58.82% <100%> (-4.82%)	16 <1> (-1)
...n/java/com/paypal/namenode/NNAnalyticsRestAPI.java	37.47% <39.53%> (-0.46%)	48 <3> (-2)
...g/apache/hadoop/hdfs/server/namenode/NNLoader.java	64.91% <0%> (-0.42%)	280% <0%> (-2%)

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