8157957: ClassNotFoundException: jdk.test.lib.JDKToolFinder
Reviewed-by: coleenp, gtriantafill, mseledtsov, iignatyev, dholmes, dsamersoff

8160088: update hotspot tests depending on GC to use @requires vm.gc.X
Reviewed-by: iignatyev, mchernov, dholmes

8153737: Unsupported Module
Reviewed-by: alanb, mchung, psandoz

8145534: TestRemsetLogging.java takes a long time
Summary: Improve the test and test settings to decrease the time it takes.
Reviewed-by: brutisso, jmasa, dfazunen

8145092: Use Unified Logging for the GC logging
Summary: JEP-271. VM changes contributed by brutisso, test changes contributed by david.
Reviewed-by: sjohanss, david, brutisso
Contributed-by: bengt.rutisson@oracle.com, david.lindholm@oralce.com