[jdk11u-dev] RFR: 8232853: AuthenticationFilter.Cache::remove may throw ConcurrentModificationException

[Andrey Turbanov]

Hi all,
This pull request contains a backport of commit [d948bfd5](https://github.com/openjdk/jdk/commit/d948bfd58406cb9b73c6fc4c50728647a5cdf6b5) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.

Original patch have changed a bit in the test code only, due to different package of `SimpleSSLContext`.
Testing: Linux x86_64, `tier1`, `jdk/java/net/httpclient`

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Commit messages:
 - Backport d948bfd58406cb9b73c6fc4c50728647a5cdf6b5

Changes: https://git.openjdk.org/jdk11u-dev/pull/1803/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1803&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8232853
  Stats: 309 lines in 2 files changed: 306 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1803.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1803/head:pull/1803

PR: https://git.openjdk.org/jdk11u-dev/pull/1803