[jdk11u-dev] RFR: 8169004: Fix redundant @requires tags in tests

[Goetz Lindenmaier]

I backport this for parity with 11.0.16-oracle.

A whole bunch of trivial resolved due to context.

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Commit messages:
 - Backport fc9941ae727b74e1b613fb977d2845ad04670577

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/1050/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=1050&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8169004
  Stats: 31 lines in 30 files changed: 0 ins; 0 del; 31 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/1050.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/1050/head:pull/1050

PR: https://git.openjdk.java.net/jdk11u-dev/pull/1050