qa/rpc-tests/segwit: Test GBT sigops before and after activation Github-Pull: #8489 Rebased-From: 160f895a80660e4e3904a2624e4110960d051902 239cbd2e5c2a36843b45b356e9aea6e8d35f0968
Amended by Pieter Wuille to use multisig 1-of-1 for P2WSH tests, and BIP9 based switchover logic. Fixes and py3 conversion by Marco Falke.