split abc-p2p-fullblocktest into sigops and non-sigops parts
Summary:
Like with D5060, it makes sense to split out the sigops part of
this test since we're planning to deactivate sigops, and this lets
us independently deal with sigops.
Test Plan: ninja check-extended
Reviewers: #bitcoin_abc, deadalnix
Reviewed By: #bitcoin_abc, deadalnix
Differential Revision: https://reviews.bitcoinabc.org/D5062