[jdk11u-dev] RFR: Merge jdk11u:master

[Goetz Lindenmaier]

Merge build tag 11.0.21-ga from jdk11u to jdk11u-dev

I had to resolve these two files.
src/java.base/share/classes/javax/security/auth/callback/ChoiceCallback.java
src/java.base/share/classes/javax/security/auth/callback/ConfirmationCallback.java
I chose the version coming from jdk11u, because 11u contains one additional change to 11u-dev.

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Commit messages:
 - Merge
 - 8317644: [11u] Remove designator DEFAULT_PROMOTED_VERSION_PRE=ea for release 11.0.21
 - 8317040: Exclude cleaner test failing on older releases
 - 8286503: Enhance security classes
 - 8284910: Buffer clean in PasswordCallback
 - 8242330: Arrays should be cloned in several JAAS Callback classes
 - 8309966: Enhanced TLS connections
 - 8297856: Improve handling of Bidi characters
 - 8296581: Better system proxy support

The webrevs contain the adjustments done while merging with regards to each parent branch:
 - master: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2195&range=00.0
 - jdk11u:master: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2195&range=00.1

Changes: https://git.openjdk.org/jdk11u-dev/pull/2195/files
  Stats: 1309 lines in 48 files changed: 967 ins; 212 del; 130 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2195.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2195/head:pull/2195

PR: https://git.openjdk.org/jdk11u-dev/pull/2195