RFR: 8275536: Add test to check that File::lastModified returns same time stamp as Files.getLastModifiedTime [v3]

[Brian Burkhalter]

On Thu, 21 Oct 2021 22:54:34 GMT, Clive Verghese <cverghese at openjdk.org> wrote:

>> The test validated that the precision returned by `java.io.File.lastModified` and `java.nio.file.Files.getLastModifiedTime` are the same.
>
> Clive Verghese has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Move test from java/nio to java/io

Marked as reviewed by bpb (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/6054