Install samtools and add SamtoolsUtils class.

[cmnbroad]

Install samtools and utilities for using samtools for test validation round-tripping.

[codecov-io]

Codecov Report

Merging #1434 into master will increase coverage by 0.076%. The diff coverage is n/a.

@@               Coverage Diff               @@
##              master     #1434       +/-   ##
===============================================
+ Coverage     68.343%   68.419%   +0.076%     
- Complexity      8489      8500       +11     
===============================================
  Files            583       583               
  Lines          34391     34410       +19     
  Branches        5729      5729               
===============================================
+ Hits           23504     23543       +39     
+ Misses          8668      8647       -21     
- Partials        2219      2220        +1

Impacted Files	Coverage Δ	Complexity Δ
...rc/main/java/htsjdk/samtools/GenomicIndexUtil.java	87.097% <0%> (-0.137%)	24% <0%> (+3%)
...in/java/htsjdk/samtools/TextualBAMIndexWriter.java	67.089% <0%> (+0.422%)	12% <0%> (ø)	:arrow_down:
.../samtools/util/BlockCompressedFilePointerUtil.java	86.667% <0%> (+1.481%)	20% <0%> (+1%)	:arrow_up:
...samtools/util/AsyncBlockCompressedInputStream.java	76% <0%> (+4%)	13% <0%> (+1%)	:arrow_up:
...ain/java/htsjdk/samtools/util/ProcessExecutor.java	48.649% <0%> (+25.676%)	10% <0%> (+6%)	:arrow_up: