Integrate Grizzly 2.3-rc6.

Author: rlubke

providers/grizzly/pom.xml

@@ -17,7 +17,7 @@
         <dependency>
             <groupId>org.glassfish.grizzly</groupId>
             <artifactId>grizzly-websockets</artifactId>
-            <version>2.3-rc4</version>
+            <version>2.3-rc6</version>
         </dependency>
         <dependency>
                    <groupId>com.ning</groupId>