Use GATKPathSpecifier for tmpDir arg.

[cmnbroad]

Fixes #5805.

[codecov-io]

Codecov Report

Merging #5832 into master will not change coverage.
The diff coverage is 100%.

@@            Coverage Diff            @@
##             master    #5832   +/-   ##
=========================================
  Coverage     87.04%   87.04%           
- Complexity    32151    32152    +1     
=========================================
  Files          1974     1974           
  Lines        147413   147413           
  Branches      16225    16225           
=========================================
  Hits         128310   128310           
  Misses        13185    13185           
  Partials       5918     5918

Impacted Files	Coverage Δ	Complexity Δ
...stitute/hellbender/cmdline/CommandLineProgram.java	84% <100%> (+0.66%)	43 <4> (ø)	⬇️
...utils/smithwaterman/SmithWatermanIntelAligner.java	50% <0%> (-30%)	1% <0%> (-2%)
...ithwaterman/SmithWatermanIntelAlignerUnitTest.java	60% <0%> (ø)	2% <0%> (ø)	⬇️
...roadinstitute/hellbender/engine/PathSpecifier.java	67.1% <0%> (+1.31%)	21% <0%> (+1%)	⬆️
...institute/hellbender/engine/GATKPathSpecifier.java	48.21% <0%> (+1.78%)	16% <0%> (+1%)	⬆️

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