Add additional test in segwit recovery activation

Summary: Add a new test case to ensure nodes won't ban each other before and after activation.

Test Plan: ./test_runner abc-segwit-recovery-activation.py

Reviewers: O1 Bitcoin ABC, #bitcoin_abc, deadalnix

Reviewed By: O1 Bitcoin ABC, #bitcoin_abc, deadalnix

Differential Revision: https://reviews.bitcoinabc.org/D2796