8024014: TEST.groups - split sub-groups for jdk_collections, jdk_stream, jdk_concurrent, jdk_util_other from jdk_util Reviewed-by: mchung, dholmes, alanb

8021591: Additional explicit null checks Reviewed-by: psandoz, alanb

8024675: java/net/NetworkInterface/UniqueMacAddressesTest.java fails on Windows Summary: amended test to add active, i.e. isUp(), NetworkInterfaces to test list Reviewed-by: alanb, chegar