Fix Jedis and RJC continuing to use pipeline after closed

DATAREDIS-162, DATAREDIS-163

src/main/java/org/springframework/data/redis/connection/jedis/JedisConnection.java

@@ -256,6 +256,7 @@ public class JedisConnection implements RedisConnection {
 	public List<Object> closePipeline() {
 		if (pipeline != null) {
 			List<Object> execute = pipeline.syncAndReturnAll();
+			pipeline = null;
 			if (execute != null && !execute.isEmpty()) {
 				Exception cause = null;
 				for (int i = 0; i < execute.size(); i++) {

src/main/java/org/springframework/data/redis/connection/rjc/RjcConnection.java

@@ -142,6 +142,7 @@ public class RjcConnection implements RedisConnection {
 
 	public List<Object> closePipeline() {
 		if (pipeline != null) {
+			pipeline = null;
 			try {
 				return RjcUtils.maybeConvert(client.getAll());
 			} catch (Exception ex) {