Try to be less special in format_number_for_remote_party_id.
Try to be less special in format_number_for_remote_party_id.

Only rewrite number to SU internal numbering plan for gateways
ending in .su.se. This makes a test case in pstnproxy work even
when using local_su_se as local-module.

bernardd/yxa,bernardd/yxa,bernardd/yxa,bernardd/yxa