Be nice to peer that relay non replay protected transactions.

Summary: Many peer will relay non replay protected transactions, so we want to be nice to them at least in the short term.

Test Plan:

make check

Reviewers: freetrader, sickpig, #bitcoin_abc, kyuupichan

Reviewed By: freetrader, #bitcoin_abc, kyuupichan

Differential Revision: https://reviews.bitcoinabc.org/D379