SDC-2705. Stage library command fails on OS X if md5sha1sum not installed.
SDC-2705. Stage library command fails on OS X if md5sha1sum not installed.

Change-Id: I881ea9e329dbf67492498425539965c2db33d941
Reviewed-on: https://review.streamsets.net/2703
Tested-by: StreamSets CI <809627f37325a679986bd660c7713476a56d59cd@streamsets.com>
Reviewed-by: Alejandro Abdelnur <eff6e25af3161e538583c5301201d7b17f64867c@streamsets.com>
Reviewed-by: Bryan Duxbury <0a3ba1af216659500dd8f41e29f3979f42452870@streamsets.com>

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