Added volatile to intermittently failing test.

- RequestScopeTest.CloseMeFactory has a field updated potentially from different threads.

Change-Id: I5d97c3677b3b9448cfcf1f7e37c6c828cf086690
Signed-off-by: Marek Potociar <marek.potociar@oracle.com>

Author: Marek Potociar

tests/e2e/src/test/java/org/glassfish/jersey/tests/e2e/common/RequestScopeTest.java

@@ -77,7 +77,7 @@ protected void configure() {
                 });
     }
 
-    public static interface CloseMe {
+    public interface CloseMe {
 
         String eval();
 
@@ -86,7 +86,7 @@ public static interface CloseMe {
 
     public static class CloseMeFactory implements Factory<CloseMe> {
 
-        public static boolean closed = false;
+        public static volatile boolean closed = false;
 
         @Override
         public CloseMe provide() {