add mobile_push_expiry usr/dom preference

db_scripts/diff/13830.down

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+DELETE FROM provisioning.voip_preferences where attribute='mobile_push_expiry';

db_scripts/diff/13830.up

@@ -0,0 +1,7 @@
+use provisioning
+
+select id into @pid from voip_preference_groups where name = 'Internals';
+
+INSERT INTO voip_preferences (attribute, type, dom_pref, usr_pref, peer_pref, data_type,
+    max_occur, description, modify_timestamp, voip_preference_groups_id) VALUES('mobile_push_expiry',
+    1, 1, 1, 0, 'int', 1, 'The expiry interval of sent push messages, after expiration of which the client should treat is as outdated and ignore.', '1970-01-01 00:00:00', @pid)