fixing vararg warnings on test compilation

[lbergelson]

fixing the 4 annoying warnings that pop up whenever you compile tests

I also added a test case that seems to have been accidentally forgotten, the variable was constructed but not added to the dataprovider.

the first commit just fixes the extraneous , the second commit has the casts and the extra test case

[codecov-io]

Codecov Report

Merging #809 into master will decrease coverage by -0.009%.
The diff coverage is n/a.

@@               Coverage Diff               @@
##              master      #809       +/-   ##
===============================================
- Coverage     64.867%   64.858%   -0.009%     
+ Complexity      7175      7174        -1     
===============================================
  Files            526       526               
  Lines          31731     31731               
  Branches        5424      5424               
===============================================
- Hits           20583     20580        -3     
- Misses          9000      9002        +2     
- Partials        2148      2149        +1

Impacted Files	Coverage Δ	Complexity Δ
...sjdk/samtools/util/Md5CalculatingOutputStream.java	70.27% <0%> (-8.108%)	7% <0%> (-1%)

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[droazen]

👍 merge when ready