bip148: functional test
bip148: functional test

Basic functional test for behaviour with -bip148 flag.

Github-Pull: #10532
Rebased-From: a050dab870e5c2fc4ee801fa3a4d87bd8c6aa38e

UASF/bitcoin,UASF/bitcoin,UASF/bitcoin,UASF/bitcoin,UASF/bitcoin,UASF/bitcoin