[jdk11u-dev] RFR: 8271506: Add ResourceHashtable support for deleting selected entries

[Goetz Lindenmaier]

I backport this for parity with 11.0.19-oracle.

I backported this from 17 because that already contains a needed adaption.

The test file did not resolve properly, context differs slightly.

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Commit messages:
 - Backport 0b51fe2bce55991e608352954a2266f4702642bf

Changes: https://git.openjdk.org/jdk11u-dev/pull/1621/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1621&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8271506
  Stats: 51 lines in 2 files changed: 51 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1621.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1621/head:pull/1621

PR: https://git.openjdk.org/jdk11u-dev/pull/1621