Adding DEFAULT_DEVICE_USER and DEFAULT_DEVICE_ADMIN

components/device-mgt/org.wso2.carbon.device.mgt.common/src/main/java/org/wso2/carbon/device/mgt/common/DeviceManagementConstants.java

@@ -90,4 +90,12 @@ public final class DeviceManagementConstants {
         public static final String DB_TYPE_H2 = "H2";
         public static final String DB_TYPE_POSTGRESQL = "PostgreSQL";
     }
+
+    public static final class Users {
+        private Users() {
+            throw new AssertionError();
+        }
+        public static final String DEFAULT_DEVICE_USER = "Internal/devicemgt-user";
+        public static final String DEFAULT_DEVICE_ADMIN = "Internal/devicemgt-admin";
+    }
 }