JDK 9 RFR of JDK-8162666: Mark ValidationWarningsTest.java as intermittently failing

[Joseph D. Darcy]

 The test

javax/xml/jaxp/unittest/common/ValidationWarningsTest.java
is known to intermittently fail (JDK-8150145) and should be marked 
accordingly.

Please review the patch below with does this (and removes an unnecessary 
space from the TEST.ROOT file).

Thanks,

-Joe

--- a/test/TEST.ROOT    Wed Jul 27 18:23:04 2016 +0300
+++ b/test/TEST.ROOT    Wed Jul 27 15:07:26 2016 -0700
@@ -15,7 +15,7 @@
 othervm.dirs=javax/xml/jaxp

 # Group definitions
-groups=TEST.groups
+groups=TEST.groups

 # Minimum jtreg version
 requiredVersion=4.2 b02
diff -r 794a2f7c2bb6 
test/javax/xml/jaxp/unittest/common/ValidationWarningsTest.java
--- a/test/javax/xml/jaxp/unittest/common/ValidationWarningsTest.java 
Wed Jul 27 18:23:04 2016 +0300
+++ b/test/javax/xml/jaxp/unittest/common/ValidationWarningsTest.java 
Wed Jul 27 15:07:26 2016 -0700
@@ -38,8 +38,9 @@

 /*
  * @test
+ * @bug 8144593
+ * @key intermittent
  * @modules javax.xml/com.sun.org.apache.xerces.internal.jaxp
- * @bug 8144593
  * @summary Check that warnings about unsupported properties from SAX
  *  parsers are suppressed during the xml validation process.
  */