sip_to_pjsip: Write local_net, contact_acl, contact_deny, and contact_permit.

When using the migration script sip_to_pjsip.py, those keys got missing. These
keys might appear several times and the function "merge_value" tried to collect
those. However, because these keys have different names in sip.conf and
pjsip.conf, "merge_value" was not able to find the new key name in sip.conf.
This change lets "merge_value" search with the old key name in sip.conf and
write with the new key name in pjsip.conf.

ASTERISK-22374

Change-Id: Ie53c5278ae6f1cb8fa7e96c5289877d46981d9d2