Addressed review feedback: update operator config endpoint to use constant file path

- Moved operator-config.json to handle volume mount overriding mount directory

Author: Behnam Mozafari

conf/operator-config.json renamed to conf/operator/operator-config.json

@@ -18,5 +18,5 @@ public class Config extends com.uid2.shared.Const.Config {
         public static final String KmsEndpointProp = "kms_aws_endpoint";
     }
 
-    public static final String OPERATOR_CONFIG_PATH = "conf/operator-config.json";
+    public static final String OPERATOR_CONFIG_PATH = "conf/operator/operator-config.json";
 }