Update various tests such as the HF happened in the past for them.

Summary: It require to update the logic to use replay protected txns. Once they are all updated, we can do away with the uahfstart time time setting.

Test Plan:

../qa/pull-tester/rpc-tests.py

Reviewers: freetrader, CCulianu, #bitcoin_abc

Reviewed By: freetrader, #bitcoin_abc

Differential Revision: https://reviews.bitcoinabc.org/D425