Improve test sql scripts

components/extensions/siddhi-extensions/io.entgra.device.mgt.plugins.extension.siddhi.device/src/test/resources/sql/h2.sql

@@ -25,6 +25,7 @@ CREATE TABLE IF NOT EXISTS DM_GROUP (
   OWNER               VARCHAR(255)  DEFAULT NULL,
   PARENT_PATH VARCHAR(255) DEFAULT NULL,
   TENANT_ID           INTEGER      DEFAULT 0,
+  PARENT_GROUP_ID     INTEGER      DEFAULT 0,
   PRIMARY KEY (ID)
 );