Align provisioning.voip_subscribers to pbx feature

Add is_pbx_group and pbx_group_id columns.
Remove legacy autoconf_* columns.

db_scripts/diff/15005.up

@@ -14,6 +14,14 @@ INSERT INTO products VALUES
 
 USE provisioning;
 
+ALTER TABLE voip_subscribers 
+  ADD COLUMN is_pbx_group TINYINT(1) NOT NULL DEFAULT 0 AFTER webpassword;
+ALTER TABLE voip_subscribers 
+  CHANGE COLUMN autoconf_group_id pbx_group_id INT(11) UNSIGNED DEFAULT NULL;
+ALTER TABLE voip_subscribers 
+  DROP COLUMN autoconf_displayname;
+
+
 CREATE TABLE `voip_pbx_groups` (
   `id` int(11) unsigned NOT NULL AUTO_INCREMENT,
   `contract_id` int(11) unsigned NOT NULL,