Fix intermittent SRP Pub/Sub test failures

SRP unsubscribes asynchronously, so occasionally not all messages were delivered prior to unsubscribe. Test will now unsubscribe on connection close instead.

src/main/java/org/springframework/data/redis/connection/srp/SrpConnection.java

@@ -52,6 +52,7 @@ import com.google.common.util.concurrent.ListenableFuture;
  * {@code RedisConnection} implementation on top of <a href="https://github.com/spullara/redis-protocol">spullara Redis Protocol</a> library.
  * 
  * @author Costin Leau
+ * @author Jennifer Hickey
  */
 public class SrpConnection implements RedisConnection {
 
@@ -139,6 +140,11 @@ public class SrpConnection implements RedisConnection {
 		isClosed = true;
 		queue.remove(this);
 
+		if (subscription != null) {
+			subscription.doClose();
+			subscription = null;
+		}
+
 		try {
 			client.close();
 		} catch (IOException ex) {