[grid] Update scheme in RedisOptions for the uri

Author: pujagani

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

@@ -55,7 +55,7 @@ public URI getRedisServerUri() {
 
     try {
       return new URI(
-        "http",
+        "redis",
         null,
         hostname.get(),
         port.get(),