TT#76111 - Add 'is_system' column to billing.admins

* The 'is_system' column will be used for users
	   that will have permission to see, create,
	   edit, delete lawful intercept admins
	 * Make the default administrator is_system and
	   revoke its lawful_intercept flag

Change-Id: Ib3349d4e5719f1a16df00647f24ac49174ccc792

db_scripts/diff/15608.down

@@ -0,0 +1,2 @@
+ALTER TABLE `billing`.`admins`
+DROP COLUMN `is_system`;

db_scripts/diff/15608.up

@@ -0,0 +1,6 @@
+ALTER TABLE `billing`.`admins`
+ADD COLUMN `is_system` TINYINT(1) NOT NULL DEFAULT 0;
+
+UPDATE `billing`.`admins`
+SET `is_system` = 1, `lawful_intercept` = 0
+WHERE  `id` = 1;