TT#133301 introducing new Auto-Attendant option

- 'aa_default' gives a possibility to add the default URI destination,
  in case no option have been previously done by the caller ;

Change-Id: I720ca1b53b2dbc04973eeebcc570772a8be1a417

db_scripts/diff/15686.down

@@ -0,0 +1,3 @@
+USE provisioning;
+
+DELETE FROM voip_sound_handles WHERE name = 'aa_default';

db_scripts/diff/15686.up

@@ -0,0 +1,8 @@
+USE provisioning;
+SET autocommit=0;
+
+SELECT id INTO @sgid FROM voip_sound_groups WHERE name = 'pbx';
+
+INSERT INTO voip_sound_handles (name, group_id, expose_to_customer) VALUES ('aa_default', @sgid, 1);
+
+COMMIT;