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

[David Holmes]

On Thu, 10 Feb 2022 15:39:53 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.

Forgot to mention copyright years need updating before integrating! Thanks.

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