NETTY-418 isCompleteFailure() and isCompleteSuccess() are both true at the same time

* Fixed incorrect isPartialSuccess(), isPartialFailure(), isCompleteFailure() implementation

Author: trustin

src/main/java/org/jboss/netty/channel/group/DefaultChannelGroupFuture.java

@@ -152,17 +152,18 @@ public synchronized boolean isCompleteSuccess() {
 
     @Override
     public synchronized boolean isPartialSuccess() {
-        return !futures.isEmpty() && successCount != 0;
+        return successCount != 0 && successCount != futures.size();
     }
 
     @Override
     public synchronized boolean isPartialFailure() {
-        return !futures.isEmpty() && failureCount != 0;
+        return failureCount != 0 && failureCount != futures.size();
     }
 
     @Override
     public synchronized boolean isCompleteFailure() {
-        return failureCount == futures.size();
+        int futureCnt = futures.size();
+        return futureCnt != 0 && failureCount == futureCnt;
     }
 
     @Override