Revert "convertAndSend returns the nr of targeted channels"

- DATAREDIS-118

- Change method return type back to void to fix backwards
compatibility issues

- Modify tests to assert specific clients receive or
don't receive messages vs comparing expected client counts

src/main/java/org/springframework/data/redis/core/RedisOperations.java

@@ -117,7 +117,7 @@ public interface RedisOperations<K, V> {
 	List<Object> exec();
 
 	// pubsub functionality on the template
-	Long convertAndSend(String destination, Object message);
+	void convertAndSend(String destination, Object message);
 
 
 	// operation types

src/main/java/org/springframework/data/redis/core/RedisTemplate.java

@@ -496,16 +496,17 @@ public class RedisTemplate<K, V> extends RedisAccessor implements RedisOperation
 	}
 
 
-	public Long convertAndSend(String channel, Object message) {
+	public void convertAndSend(String channel, Object message) {
 		Assert.hasText(channel, "a non-empty channel is required");
 
 		final byte[] rawChannel = rawString(channel);
 		final byte[] rawMessage = rawValue(message);
 
-		return execute(new RedisCallback<Long>() {
+		execute(new RedisCallback<Object>() {
 
-			public Long doInRedis(RedisConnection connection) {
-				return connection.publish(rawChannel, rawMessage);
+			public Object doInRedis(RedisConnection connection) {
+				connection.publish(rawChannel, rawMessage);
+				return null;
 			}
 		}, true);
 	}