[jdk17u-dev] RFR: 8281585: Remove unused imports under test/lib and jtreg/gc

[Goetz Lindenmaier]

I backport this for parity with 17.0.11-oracle.

Some simple resolves were needed:
test/hotspot/jtreg/gc/arguments/TestArrayAllocatorMallocLimit.java
Copyright.

test/hotspot/jtreg/gc/arguments/TestG1HeapRegionSize.java
Resolved import.

test/hotspot/jtreg/gc/arguments/TestG1RemSetFlags.java
Not in 17.

test/hotspot/jtreg/gc/arguments/TestVerifyBeforeAndAfterGCFlags.java
Copyright and imports due to context.

test/hotspot/jtreg/gc/g1/TestEvacuationFailure.java
Test not in 17.

test/hotspot/jtreg/gc/g1/TestSkipRebuildRemsetPhase.java
Resulved imports due to differences in context.

test/lib/jdk/test/lib/hprof/model/JavaValueArray.java
Copyright

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Commit messages:
 - Backport 2604a88fbb6d0f9aec51c7d607ea275bc34a672c

Changes: https://git.openjdk.org/jdk17u-dev/pull/2154/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=2154&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8281585
  Stats: 141 lines in 58 files changed: 0 ins; 86 del; 55 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/2154.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/2154/head:pull/2154

PR: https://git.openjdk.org/jdk17u-dev/pull/2154