[jdk8u-dev] RFR: 8155590: Dubious collection management in sun.net.www.http.KeepAliveCache

[Dhamoder Nalla]

Issue:  [JDK-8155590](https://bugs.openjdk.org/browse/JDK-8155590) Dubious collection management in sun.net.www.http.KeepAliveCache

Backport of 2e31cc7ee1b875af7c7b3a5367ac8056fbc60650

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Commit messages:
 - Backport of 2e31cc7ee1b875af7c7b3a5367ac8056fbc60650

Changes: https://git.openjdk.org/jdk8u-dev/pull/407/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=407&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8155590
  Stats: 103 lines in 1 file changed: 37 ins; 39 del; 27 mod
  Patch: https://git.openjdk.org/jdk8u-dev/pull/407.diff
  Fetch: git fetch https://git.openjdk.org/jdk8u-dev.git pull/407/head:pull/407

PR: https://git.openjdk.org/jdk8u-dev/pull/407