Fix Spark tools to write SAM files when a .sam suffix is specified.

[tomwhite]

Fixes #4295.
Relies on HadoopGenomics/Hadoop-BAM#195.

[codecov-io]

Codecov Report

Merging #4471 into master will increase coverage by 0.017%.
The diff coverage is 100%.

@@              Coverage Diff               @@
##              master    #4471       +/-   ##
==============================================
+ Coverage     80.062%   80.08%   +0.017%     
- Complexity     17417    17422        +5     
==============================================
  Files           1080     1080               
  Lines          63107    63131       +24     
  Branches       10196    10200        +4     
==============================================
+ Hits           50525    50555       +30     
+ Misses          8589     8583        -6     
  Partials        3993     3993

Impacted Files	Coverage Δ	Complexity Δ
...ender/engine/spark/datasources/ReadsSparkSink.java	77.698% <100%> (+4.654%)	29 <4> (+3)	⬆️
...oadinstitute/hellbender/utils/gcs/BucketUtils.java	80% <0%> (+1.29%)	40% <0%> (ø)	⬇️
...utils/smithwaterman/SmithWatermanIntelAligner.java	90% <0%> (+40%)	3% <0%> (+2%)	⬆️

[lbergelson]

Looks good to me 👍

[lbergelson]

@tomwhite Thank you!