RFR: 8256894: define test groups

[Ivan Šipka]

Defined new test groups as defined in ticket. @fguallini

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Commit messages:
 - 8256894: removing manual tests from corelibs tests
 - 8256894: define test groups

Changes: https://git.openjdk.java.net/jdk/pull/1416/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=1416&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8256894
  Stats: 52 lines in 1 file changed: 51 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1416.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1416/head:pull/1416

PR: https://git.openjdk.java.net/jdk/pull/1416