RFR: 8295729: Add jcheck whitespace checking for properties files

[Chris Plummer]

On Thu, 20 Oct 2022 18:38:43 GMT, Andy Goryachev <angorya at openjdk.org> wrote:

> `White space following the property value is not ignored, and is treated as part of the property value.`

Although I didn't know this was in the spec, I suspected it might be the case. When looking at the jdk.management.agent changes, it looked like the extra space was actually a typo and was copied into all the localized versions (and not actually localized for unicode locales). In this case removing the white space is the right thing to do. It is in fact fixing an actual bug.

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