MT#8129 introduce conference_pin preference

Change-Id: Ie24e9faf6bc5e3564a1b743737916c55a30178df

db_scripts/diff/15132.up

@@ -0,0 +1,6 @@
+use provisioning
+
+SELECT id INTO @vpgid FROM voip_preference_groups WHERE name = 'Internals';
+
+INSERT INTO voip_preferences(id,voip_preference_groups_id, attribute, label, type, max_occur, usr_pref, prof_pref, dom_pref, peer_pref, contract_pref, modify_timestamp, internal, expose_to_customer, data_type, read_only, description) VALUES
+  (NULL,@vpgid,'conference_pin','PIN for access to pin-protected conference',0,1,1,0,0,0,0,NULL,0,0,'string',0,'PIN for access to private conferencing service.');