Ensure all pipelined commands use a dedicated connection to avoid lingering commands when using pipelining with flushing customization.

Original Pull Request: #2088

src/main/java/org/springframework/data/redis/connection/lettuce/LettuceConnection.java

@@ -943,7 +943,7 @@ public class LettuceConnection extends AbstractRedisConnection {
 	}
 
 	RedisClusterAsyncCommands<byte[], byte[]> getAsyncConnection() {
-		if (isQueueing()) {
+		if (isQueueing() || isPipelined()) {
 			return getAsyncDedicatedConnection();
 		}
 		if (asyncSharedConn != null) {