RFR: 8256894: define test groups

[Igor Ignatyev]

On Wed, 25 Nov 2020 20:31:50 GMT, Ivan Šipka <isipka at openjdk.org> wrote:

>> test/jdk/TEST.groups line 327:
>> 
>>> 325:     :core_tools \
>>> 326:     :jdk_other \
>>> 327:     :jdk_core_manual
>> 
>> Please don't add manual tests to jdk_core.
>
> Removed.

aren't they already a part of `jdk_core` test group? e.g. `java/net/HugeDataTransferTest.java` is in `:jdk_net` (as `jdk_net` includes `java/net` directory), and `:jdk_core` includes `:jdk_net`?

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