RFR: 8279022: JCmdTestFileSafety.java should check file time stamp for test result [v2]

[Yumin Qi]

On Tue, 21 Dec 2021 17:58:57 GMT, Calvin Cheung <ccheung at openjdk.org> wrote:

>> Yumin Qi has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Refactor remove file code
>
> Update looks good.

@calvinccheung thanks for review!

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PR: https://git.openjdk.java.net/jdk/pull/6904