Fixed dao service tests

-TRUNCATE TABLE admin_settings;
-TRUNCATE TABLE alarm;
-TRUNCATE TABLE asset;
-TRUNCATE TABLE attribute_kv;
-TRUNCATE TABLE component_descriptor;
-TRUNCATE TABLE customer;
-TRUNCATE TABLE dashboard;
-TRUNCATE TABLE device;
-TRUNCATE TABLE device_credentials;
-TRUNCATE TABLE event;
-TRUNCATE TABLE plugin;
-TRUNCATE TABLE relation;
-TRUNCATE TABLE rule;
-TRUNCATE TABLE tb_user;
-TRUNCATE TABLE tenant;
-TRUNCATE TABLE ts_kv;
-TRUNCATE TABLE ts_kv_latest;
-TRUNCATE TABLE user_credentials;
-TRUNCATE TABLE widget_type;
-TRUNCATE TABLE widgets_bundle;
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+DROP TABLE IF EXISTS admin_settings;
+DROP TABLE IF EXISTS alarm;
+DROP TABLE IF EXISTS asset;
+DROP TABLE IF EXISTS attribute_kv;
+DROP TABLE IF EXISTS component_descriptor;
+DROP TABLE IF EXISTS customer;
+DROP TABLE IF EXISTS dashboard;
+DROP TABLE IF EXISTS device;
+DROP TABLE IF EXISTS device_credentials;
+DROP TABLE IF EXISTS event;
+DROP TABLE IF EXISTS plugin;
+DROP TABLE IF EXISTS relation;
+DROP TABLE IF EXISTS rule;
+DROP TABLE IF EXISTS tb_user;
+DROP TABLE IF EXISTS tenant;
+DROP TABLE IF EXISTS ts_kv;
+DROP TABLE IF EXISTS ts_kv_latest;
+DROP TABLE IF EXISTS user_credentials;
+DROP TABLE IF EXISTS widget_type;
+DROP TABLE IF EXISTS widgets_bundle;
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