[LIVY-981] Exclude test and provided scopes from THIRD-PARTY license generation

[dacort]

What changes were proposed in this pull request?

• Added test,provided to excludedScopes property for license maven plugin.
• https://issues.apache.org/jira/browse/LIVY-981

How was this patch tested?

• Generated licenses manually, identified test-scope license removed from generated file

Please review https://livy.incubator.apache.org/community/ before opening a pull request.

[codecov-commenter]

Codecov Report

Merging #425 (76a1f45) into master (8b2e29f) will increase coverage by 2.58%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #425      +/-   ##
============================================
+ Coverage     65.48%   68.07%   +2.58%     
- Complexity      950      979      +29     
============================================
  Files           103      103              
  Lines          6062     6062              
  Branches        916      916              
============================================
+ Hits           3970     4127     +157     
+ Misses         1541     1349     -192     
- Partials        551      586      +35     

see 25 files with indirect coverage changes

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