[jdk11u-dev] RFR: 8244292: Headful clients failing with --illegal-access=deny

[Goetz Lindenmaier]

I downport this for parity with 11.0.13-oracle.

The patch to TabbedPaneMemLeak.java is not needed because the test is not in 11.  JDK-6714324 is missing in 11u which brings the new test.  I commented in the bug to include this fix in case it is downported.
The rest applied clean.

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Commit messages:
 - Backport 0efacb3eedf79dceb6aa185057df2658ce899723

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/403/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=403&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8244292
  Stats: 6 lines in 3 files changed: 1 ins; 0 del; 5 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/403.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/403/head:pull/403

PR: https://git.openjdk.java.net/jdk11u-dev/pull/403