[jdk11u] RFR: 8277795: ldap connection timeout not honoured under contention

Fri Mar 4 13:35:38 UTC 2022

I backport this for parity with 11.0.15-oracle.

I had to resolve the second hunk to Connections.java due to conflicts.
Final and private keywords are swapped in 18.
I had to adapt the spelling of a message in the test. 11 does not 
capitalize the sentence "connect timed out".

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Commit messages:
 - Backport 3d926dd66ef6551e91a4ebbbc59dcff58f5ede5a

Changes: https://git.openjdk.java.net/jdk11u/pull/29/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u&pr=29&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8277795
  Stats: 468 lines in 5 files changed: 325 ins; 72 del; 71 mod
  Patch: https://git.openjdk.java.net/jdk11u/pull/29.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u pull/29/head:pull/29

PR: https://git.openjdk.java.net/jdk11u/pull/29