TT#133301 Let 'voip_pbx_autoattendants.choice' be compatible with string literals

As the option to add default actions has been introduced for Auto-Attendant,
where we are using string literals as lables/values, we need to let the SQL
structure be compatible with this update.

Hence our customers will be able to set and then see the default action
in the Auto-Attendant menu for a subscriber.

Change-Id: I949d7b72c9211588389a64df9af49b0201587d87

db_scripts/diff/15687.down

@@ -0,0 +1,8 @@
+USE provisioning;
+SET autocommit=0;
+
+DELETE FROM provisioning.voip_pbx_autoattendants WHERE choice = 'default';
+
+ALTER TABLE provisioning.voip_pbx_autoattendants MODIFY choice TINYINT(3) NOT NULL;
+
+COMMIT;

db_scripts/diff/15687.up

@@ -0,0 +1,6 @@
+USE provisioning;
+SET autocommit=0;
+
+ALTER TABLE provisioning.voip_pbx_autoattendants MODIFY choice VARCHAR(16) NOT NULL;
+
+COMMIT;