SDC-6205. Update jsch to 0.1.54.
SDC-6205. Update jsch to 0.1.54.

Fixes CVE-2016-5725 and several other bugs.

Change-Id: Id5c5ff9a5d619ed27abd1b82d5a3603072bb0362
Reviewed-on: https://review.streamsets.net/8291
Tested-by: StreamSets CI <809627f37325a679986bd660c7713476a56d59cd@streamsets.com>
Reviewed-by: Jarcec Cecho <df2d427dacaa504f2ede0aed47c4cdf043778b95@streamsets.com>

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