[Dubbo-4765] fix demo dependencies (apache#4832)

* fix demo run
* add multicast

Author: mzorro

dubbo-demo/dubbo-demo-api/dubbo-demo-api-consumer/pom.xml

@@ -42,6 +42,14 @@
             <groupId>org.apache.dubbo</groupId>
             <artifactId>dubbo-registry-multicast</artifactId>
         </dependency>
+        <dependency>
+            <groupId>org.apache.dubbo</groupId>
+            <artifactId>dubbo-registry-zookeeper</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.dubbo</groupId>
+            <artifactId>dubbo-configcenter-zookeeper</artifactId>
+        </dependency>
         <dependency>
             <groupId>org.apache.dubbo</groupId>
             <artifactId>dubbo-rpc-dubbo</artifactId>

dubbo-demo/dubbo-demo-api/dubbo-demo-api-provider/pom.xml

@@ -44,6 +44,14 @@
             <groupId>org.apache.dubbo</groupId>
             <artifactId>dubbo-registry-multicast</artifactId>
         </dependency>
+        <dependency>
+            <groupId>org.apache.dubbo</groupId>
+            <artifactId>dubbo-registry-zookeeper</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.dubbo</groupId>
+            <artifactId>dubbo-configcenter-zookeeper</artifactId>
+        </dependency>
         <dependency>
             <groupId>org.apache.dubbo</groupId>
             <artifactId>dubbo-rpc-dubbo</artifactId>