net: Add NAT-PMP to port mapping loop
Summary:
This is a backport of core#18077 [8/13]
https://github.com/bitcoin/bitcoin/pull/18077/commits/28acffd9d53ec437e908abb8c84497a4f41b91ed
Depends on D12075
Test Plan: ninja all check-all
Reviewers: #bitcoin_abc, Fabien
Reviewed By: #bitcoin_abc, Fabien
Differential Revision: https://reviews.bitcoinabc.org/D12092