RFR: 8295729: Add jcheck whitespace checking for properties files [v3]

[Andy Goryachev]

On Mon, 24 Oct 2022 19:34:56 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

> For the files which have trailing "whitespace" (now as unicode sequences), I will file follow-up bugs on the respective components to verify if this is indeed correct, or a bug that should be fixed.

probably not needed - if nobody noticed anything until now we have no problem.  the solution to escape whitespace in values is the right solution, solves both the jcheck and WS visibility issues.

good job!

(and we can ignore my "prob. unnecessary" comments)

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PR: https://git.openjdk.org/jdk/pull/10792