RFR: 8281585: Remove unused imports under test/lib and jtreg/gc [v2]

[Serguei Spitsyn]

On Fri, 11 Feb 2022 08:54:51 GMT, Leo Korinth <lkorinth at openjdk.org> wrote:

>> Remove unused imports under test/lib and jtreg/gc. They create lots of warnings if editing using an IDE. Tests in hotspot_gc passed.
>
> Leo Korinth has updated the pull request incrementally with one additional commit since the last revision:
> 
>   updating copyright

Looks good.
Thanks,
Serguei

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Marked as reviewed by sspitsyn (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/7426