[jdk15u-dev] RFR: 8258753: StartTlsResponse.close() hangs due to synchronization issues

[Yuri Nesterenko]

I'd like to backport this fix here, too. The patch applies cleanly, tier tests run OK.

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Commit messages:
 - Backport 415553325831b79a7e55071f6bd7c73eb1a636ec

Changes: https://git.openjdk.java.net/jdk15u-dev/pull/85/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk15u-dev&pr=85&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8258753
  Stats: 17 lines in 1 file changed: 8 ins; 2 del; 7 mod
  Patch: https://git.openjdk.java.net/jdk15u-dev/pull/85.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk15u-dev pull/85/head:pull/85

PR: https://git.openjdk.java.net/jdk15u-dev/pull/85