[backport#16756] test: Connection eviction logic tests
Summary:
45eff751c6d07007dabc365dc4c0e6c63e3fe5cf Add functional test for P2P eviction logic of inbound peers (Martin Zumsande)
Pull request description:
This adds a functional test for the eviction logic for inbound peers, which is triggered when the number of maximum connections is exceeded. The functional test covers eviction protection for peers that have sent us blocks or txns recently, or that have faster pings. I couldn't find a way to test the logic of `CConnman::AttemptToEvictConnection` that is based on netgroup (see #14210 for related discussion) Fixes #16660 (at least partially). [Edit: Earlier, this PR also contained a unit test, which was removed after the discussion]
Backport of core#16756
Test Plan:
ninja all && ./test/test_runner.py p2p_eviction
Reviewers: #bitcoin_abc, PiRK
Reviewed By: #bitcoin_abc, PiRK
Differential Revision: https://reviews.bitcoinabc.org/D9510