TT#76109 - Introduce email column from admins

* Store 'email' for administrators to use
           for password reset
         * Add additional 'can_reset_passsword' column
           to indicate wether an admin can request
           password reset

Change-Id: If383e1328eb091c68b8419c574dfae307e1b7920

db_scripts/diff/15601.down

@@ -0,0 +1,3 @@
+ALTER TABLE `billing`.`admins`
+DROP COLUMN `email`,
+DROP COLUMN `can_reset_password`;

db_scripts/diff/15601.up

@@ -0,0 +1,3 @@
+ALTER TABLE `billing`.`admins`
+ADD COLUMN `email` VARCHAR(255) UNIQUE DEFAULT NULL,
+ADD COLUMN `can_reset_password` TINYINT(1) NOT NULL DEFAULT 1;