RFR: 8276994: java/nio/channels/Channels/TransferTo.java leaves multi-GB files in /tmp [v3]

[Markus KARG]

On Sat, 27 Nov 2021 10:07:36 GMT, Markus KARG <duke at openjdk.java.net> wrote:

>> This PR proposes to cleanup *all* temp files of the `TransferTo` test, not just the 2GB files. Also it separates the actual test logic from the cleanup logic, so the test cases are simple to understand again as they are not interwoven with cleanup code anymore.
>
> Markus KARG has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Creating temp files in current working directory
>   
>   Signed-off-by: Markus Karg <markus at headcrashing.eu>

I have integrated the changes we agreed upon from this PR into PR https://github.com/openjdk/jdk/pull/5179, hence I hereby close *this* PR.

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PR: https://git.openjdk.java.net/jdk/pull/6379