RFR: 8290313: Produce warning when user specified java.io.tmpdir directory doesn't exist [v3]

[Alan Bateman]

On Fri, 18 Nov 2022 14:45:56 GMT, Weibing Xiao <duke at openjdk.org> wrote:

>> print warning message for java.io.tmpdir when it is set through the command line and the value is not good for creating file folder.
>
> Weibing Xiao has updated the pull request incrementally with one additional commit since the last revision:
> 
>   update according to review comment

The src changes in update ede6c42e look okay. The test name is a bit strange, maybe a name like TempDirDoesNotExist.java would work better.

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PR: https://git.openjdk.org/jdk/pull/11174