Moved TestNG from the main repo into separate mockito/mockito-testng repo

[mockitoguy]

New home for TestNG integration is: https://github.com/mockito/mockito-testng

For details and discussion, see: #962

[codecov-io]

Codecov Report

Merging #1465 into release/2.x will decrease coverage by 0.19%.
The diff coverage is n/a.

@@               Coverage Diff               @@
##             release/2.x   #1465     +/-   ##
===============================================
- Coverage           88.2%     88%   -0.2%     
+ Complexity          2384    2378      -6     
===============================================
  Files                298     298             
  Lines               6020    6020             
  Branches             729     729             
===============================================
- Hits                5310    5298     -12     
- Misses               530     541     +11     
- Partials             180     181      +1

Impacted Files	Coverage Δ	Complexity Δ
...ockito/internal/util/reflection/InstanceField.java	50% <0%> (-25%)	9% <0%> (-5%)
...a/org/mockito/internal/util/reflection/Fields.java	82.5% <0%> (-15%)	7% <0%> (-1%)

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[mockitoguy]

Thank you for review and for support on strategy to minimize Mockito repo!