Add up/down scripts for outbound_socket pref.

db_scripts/diff/9256.down

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+USE provisioning;
+
+SELECT id FROM voip_preferences WHERE attribute='outbound_socket' INTO @obs_pref_id;
+DELETE FROM voip_preferences_enum WHERE preference_id = @obs_pref_id;
+DELETE FROM voip_preferences WHERE id = @obs_pref_id;

db_scripts/diff/9256.up

@@ -0,0 +1,5 @@
+USE provisioning;
+
+INSERT INTO voip_preferences VALUES(NULL, 'outbound_socket', 0, 1, 1, 1, 1, now(), 0, 'enum', 0, 'Outbound socket to be used for SIP communication to this entity');
+SELECT last_insert_id() INTO @obs_pref_id;
+INSERT INTO voip_preferences_enum VALUES(NULL, @obs_pref_id, 'default', NULL, 1, 1, 1, 1);