Increase the debug log assertion timeout in abc_feature_minerfund.py test

Summary: The test is not long but the log assertions have a default timeout of 2s, which might not be enough to download a block on slow machines. Also bypass the p2p delays to speed it up a bit.

Test Plan:

./test/functional/test_runner.py abc_feature_minerfund

Reviewers: #bitcoin_abc, PiRK

Reviewed By: #bitcoin_abc, PiRK

Differential Revision: https://reviews.bitcoinabc.org/D17436