[jdk11u-dev] RFR: 8039261: [TEST_BUG]: There is not a minimal security level in Java Preferences and the TestApplet.html is blocked.

[Goetz Lindenmaier]

I downport this for parity with 11.0.13-oracle.

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Commit messages:
 - Backport 26186ec3f69d48446f18a5a91ea70d3e7f51436a

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/425/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=425&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8039261
  Stats: 592 lines in 9 files changed: 0 ins; 592 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/425.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/425/head:pull/425

PR: https://git.openjdk.java.net/jdk11u-dev/pull/425