Fix compilation

Author: Rival Abdrakhmanov

Utils/azure-toolkit-ide-hdinsight-libs/azuretools-core/test/com/microsoft/azuretools/core/mvp/model/rediscache/RedisCacheMock.java

@@ -165,6 +165,11 @@ public RedisAccessKeys regenerateKey(RedisKeyType keyType) {
         return new RedisAccessKeysMock();
     }
 
+    @Override
+    public PublicNetworkAccess publicNetworkAccess() {
+        return null;
+    }
+
     @Override
     public TlsVersion minimumTlsVersion() {
         return null;