8081775: two lib/testlibrary tests are failing with "Error. failed to clean up files after test" with jtreg 4.1 b12Reviewed-by: slaContributed-by: amy.lu@oracle.com
8081347: Add @modules to jdk_core testsReviewed-by: alanb, joehw, lanceaContributed-by: alexander.kulyakhtin@oracle.com, alan.bateman@oracle.com, mandy.chung@oracle.com
8056143: interrupted java/lang/management/MemoryMXBean/LowMemoryTest.java leaves running processReviewed-by: sla, dholmes
8015497: Take new fixes from hotspot/test/testlibrary to jdk/test/lib/testlibraryReviewed-by: sla