ZEN-38683: PKG/SPEC - expanse/0.17.3/cpu/b - Install bamUtil v1.0.15

[mkandes]

User requested the installation of bamUtil [1] [2].

[1] https://github.com/statgen/bamUtil
[2] https://sdsc.zendesk.com/agent/tickets/38683

[mkandes]

Updated package to include bamUtil v1.0.14 and v1.0.15. Note, however, at some point in the future, we may want to segment out libStatGen as a standalone Spack package --- it is currently not. Pull request #134 created and successfully merged.

[mkandes]

bamUtil v1.0.15 deployed into expanse/0.17.3/cpu/b. Waiting on user to test and confirm installation works as expected.

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