fanquake 0be2f5481c Merge bitcoin/bitcoin#27986: test: remove race in the user-agent reception check
20b49460b3 test: remove race in the user-agent reception check (Vasil Dimov)

Pull request description:

  In `add_p2p_connection()` we connect to `bitcoind` from the Python client and check that it has received our version string.

  This check looked up the last/newest entry from `getpeerinfo` RPC, assuming that it must be the connection we have just opened. But this will not be the case if a new inbound or outbound connection is made to/from `bitcoind` in the meantime.

  Instead of the last entry in `getpeerinfo`, check all and find the one which corresponds to our connection using our outgoing address:port tuple which is unique.

ACKs for top commit:
  jonatack:
    re-ACK 20b49460b3
  MarcoFalke:
    Concept ACK 20b49460b3

Tree-SHA512: 61fd3359ef11ea830021ede0e745497a7b60690c32d21c47cd12ff79f78907bb45e922c9d01e5d7ff614a8cd5e4560d39a3fc86b01b200429773a23ace3917e4
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