Support WAIT in Pipeline (redis#2600)

* Support WAIT in Pipeline

* test wait in pipeline

Author: sazzad16

src/main/java/redis/clients/jedis/Pipeline.java

@@ -157,4 +157,9 @@ public void close() {
     clear();
   }
 
+  public Response<Long> waitReplicas(int replicas, long timeout) {
+    client.waitReplicas(replicas, timeout);
+    return getResponse(BuilderFactory.LONG);
+  }
+
 }

src/test/java/redis/clients/jedis/tests/PipeliningTest.java

@@ -409,6 +409,19 @@ public void testDiscardInPipeline() {
     get.get();
   }
 
+  @Test
+  public void waitReplicas() {
+    Pipeline p = jedis.pipelined();
+    p.set("wait", "replicas");
+    p.waitReplicas(1, 10);
+    p.sync();
+
+    try (Jedis j = new Jedis(HostAndPortUtil.getRedisServers().get(4))) {
+      j.auth("foobared");
+      assertEquals("replicas", j.get("wait"));
+    }
+  }
+
   @Test
   public void testEval() {
     String script = "return 'success!'";