RFR: 7902649: Allow a testsuite to define several TestFilters specific for this suite

[Dmitry Bessonov]

On Wed, 29 Apr 2020 16:56:54 GMT, Dmitry Bessonov <dbessono at openjdk.org> wrote:

> Currently TestSuite class has a method to override that returns only one test filter:
> 
> TestFilter createTestFilter(TestEnvironment)
> 
> There are situations when test suite has several test filters that it is forced however to hide behind an umbrella
> filter. It is more natural and convenient to let test suite return a collection of atomized filters that would be
> iterated on the JTHarness side and listed in the test run stats separately and informatively.

Most complex changes are in ET_FilterHandler.java

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PR: https://git.openjdk.java.net/jtharness/pull/2