WIP: [backport] Merge #15013: test: Avoid race in p2p_timeouts

fabcd645b9 test: Avoid racy test p2p_timeouts (MarcoFalke)

Pull request description:

Avoid filesystem/network racyness by sleeping another second. The alternative would be to poll the debug.log, but that seems overkill to avoid a sleep in a test that already requires them.

Tree-SHA512: 32de75ecba38426323158fda241e37ffae73806d8c0e60b7ad73fb917e9cd25a3e5f0722cbc6f2f7a5b86501221c317783266bc2e3b4697fb120f05898ccc12d

Backport of Core [[https://github.com/bitcoin/bitcoin/pull/15013 | PR15013]]

Depends on D5827

Test Plan:

test_runner.py p2p_timeouts  # run a few times

Differential Revision: https://reviews.bitcoinabc.org/D5828