RFR(S) : 8246387 : switch to jtreg 5.1

[Igor Ignatyev]

http://cr.openjdk.java.net/~iignatyev/8246387/webrev.00/
> 110 lines changed: 6 ins; 89 del; 15 mod;

Hi all,

could you please review the patch which switches jtreg used in jdk/jdk to the newly promoted jtreg5.1? as before, the patch changes 'requiredVersion' property in all jtreg test suites to have more consistent results.

besides changing the version in jib-profiles and requiredVersion in all TEST.ROOT, the patch also 
 - removes no-op methods from GatherDiagnosticInfoObserver. in jtharness 6.0-b11, and Harness.Observer::finishedTesting() method got deprecated, but instead of suppressing the warning, we can just remove it and other empty methods as Harness.Observer interface now provides no-op implementations for all its methods; 
 - removes j.t.lib.Utils::getTestName method. this method has a (now) wrong assumption that testng classes are available only if we are executing a testng test. the method was used only by appcds tests to get a test specific filename, and these tests were updated to use a new supported way to get a testname via `test.name` system property; 
 - updates test/hotspot/jtreg/runtime/condy/staticInit/TestInitException.java test to workaround CODETOOLS-7902686[1] . jasm from asmtools 7.0-b08 incorrectly sets full file path on windows as SourceFile, so the test was temporarily updated to use regexp which matches both full path and just basename.
 

webrev: http://cr.openjdk.java.net/~iignatyev/8246387/webrev.00/
testing: tier1-4
JBS: https://bugs.openjdk.java.net/browse/JDK-8246387

[1] https://bugs.openjdk.java.net/browse/CODETOOLS-7902686
(fixed in asmtools7.0-b09, yet jtreg5.1 uses asmtools7.0-b08, so effectively can be fixed only w/ switch to a next version of jtreg) 

Thanks,
-- Igor