TT#144850 add reseller fk to billing domains

- add column reseller_id to billing.domains
- add reseller_id index
- update zero-values of added column by joining billing.domain_resellers
  table
- add foreign key constraint reseller_id
- add .down script to undo changes

Change-Id: I36fd19b11618da864fb7a9ef72f12a2cd9f05a59

db_scripts/diff/15699.down

@@ -0,0 +1,6 @@
+USE billing;
+
+ALTER TABLE domains
+DROP FOREIGN KEY `d_resellerid_ref`,
+DROP KEY `resellerid_idx`,
+DROP COLUMN reseller_id;

db_scripts/diff/15699.up

@@ -0,0 +1,13 @@
+USE billing;
+
+ALTER TABLE domains
+ADD `reseller_id` int(11) unsigned NOT NULL,
+ADD KEY `resellerid_idx` (`reseller_id`);
+
+UPDATE domains d
+INNER JOIN domain_resellers dr
+ON d.id = dr.domain_id
+SET d.reseller_id=dr.reseller_id;
+
+ALTER TABLE domains
+ADD CONSTRAINT `d_resellerid_ref` FOREIGN KEY (`reseller_id`) REFERENCES `resellers` (`id`) ON DELETE CASCADE ON UPDATE CASCADE;