Add ip_header preference.

db_scripts/diff/11817.down

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+USE provisioning;
+DELETE FROM voip_preferences where attribute='ip_header';

db_scripts/diff/11817.up

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+USE provisioning;
+
+INSERT INTO voip_preferences (attribute, type, usr_pref, dom_pref, peer_pref, data_type, max_occur, description)
+VALUES('ip_header', 0, 1, 1, 1, 'string', 1, 'The SIP header to take the IP address for logging it into CDRs.');