[Backport]test: add BIP37 'filterclear' test to p2p_filter.py
Summary:
Depends on D7541
Backport of Bitcoin Core PR18481
Test Plan: test/functional/test_runner.py p2p_filter.py
Reviewers: O1 Bitcoin ABC, #bitcoin_abc, jasonbcox, deadalnix
Reviewed By: O1 Bitcoin ABC, #bitcoin_abc, jasonbcox, deadalnix
Differential Revision: https://reviews.bitcoinabc.org/D7542