[jdk11u-dev] RFR: 8282293: Domain value for system property jdk.https.negotiate.cbt should be case-insensitive

[Martin Doerr]

Backport of [JDK-8282293](https://bugs.openjdk.java.net/browse/JDK-8282293)
(Add-on to [JDK-8279842](https://bugs.openjdk.java.net/browse/JDK-8279842))
Applies cleanly except addition of BugID to test which had to get done manually.

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Commit messages:
 - Backport 86015e15a5105a779ee065cca64479c8d4fbc074

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/1076/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=1076&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8282293
  Stats: 11 lines in 2 files changed: 8 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/1076.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/1076/head:pull/1076

PR: https://git.openjdk.java.net/jdk11u-dev/pull/1076