[test] Make abc_p2p_avalanche_voting more robust

Summary: By restarting the node and having better control of the order of events.

Test Plan:

for i in {1..20}; do ./test/functional/test_runner.py abc_p2p_avalanche_voting || break; done

Reviewers: #bitcoin_abc, PiRK

Reviewed By: #bitcoin_abc, PiRK

Differential Revision: https://reviews.bitcoinabc.org/D14625