[grid] Add tests for using local distributor with Redis Grid Model

Author: pujagani

java/server/src/org/openqa/selenium/grid/distributor/gridmodel/redis/RedisGridModel.java

@@ -445,4 +445,7 @@ public NodeStatus rewrite(NodeStatus status, Availability availability) {
       status.getOsInfo());
   }
 
+  public GridRedisClient getRedisClient() {
+    return redisClient;
+  }
 }

java/server/test/org/openqa/selenium/grid/distributor/gridmodel/RedisGridModelTest.java

@@ -128,10 +128,6 @@ public void setUp() throws URISyntaxException {
       .build();
   }
 
-  @After
-  public void cleanUp() {
-
-  }
   @AfterClass
   public static void tearDownRedisServer() {
     safelyCall(() -> server.stop());