RFR: 8306812: Open source several AWT Miscellaneous tests

[Tejesh R]

Open source few AWT Miscellaneous ( Panel, Popup, robot and scrollbar) tests.

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Commit messages:
 - Open source few Applet test
 - Open source few Applet test

Changes: https://git.openjdk.org/jdk/pull/13828/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13828&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8306812
  Stats: 542 lines in 5 files changed: 542 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/13828.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13828/head:pull/13828

PR: https://git.openjdk.org/jdk/pull/13828