8151731: Add new jtreg keywords to jdk 8

Summary: randomness and intermittent keywords to mark regression tests
Reviewed-by: coffeys

test/TEST.ROOT

 # This file identifies the root of the test-suite hierarchy.
 # It also contains test-suite configuration information.
 
-# The list of keywords supported in the entire test suite
-keys=2d dnd i18n
+# The list of keywords supported in the entire test suite.  The
+# "intermittent" keyword marks tests known to fail intermittently.
+# The "randomness" keyword marks tests using randomness with test
+# cases differing from run to run. (A test using a fixed random seed
+# would not count as "randomness" by this definition.) Extra care
+# should be taken to handle test failures of intermittent or
+# randomness tests.
+
+keys=2d dnd i18n intermittent randomness
 
 # Tests that must run in othervm mode
 othervm.dirs=java/awt java/beans java/rmi javax/accessibility javax/imageio javax/sound javax/print javax/management com/sun/awt sun/awt sun/java2d sun/pisces sun/rmi