[jdk11u-dev] RFR: 8307078: Opensource and clean up five more AWT Focus related tests

[Andrew Lu]

I backport this for parity with 11.0.21-oracle.

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Commit messages:
 - Backport 6d6f726b74f7fcd3e7c37d50bd2476b3e921662b

Changes: https://git.openjdk.org/jdk11u-dev/pull/2083/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2083&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8307078
  Stats: 965 lines in 5 files changed: 965 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2083.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2083/head:pull/2083

PR: https://git.openjdk.org/jdk11u-dev/pull/2083