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Previously, `wait_for_getheaders` would check whether a node had received **any** getheaders message. This implied that, if a test needed to check for a specific block hash within a headers message, it had to make sure that it was checking the desired message. This normally involved having to manually clear `last_message`. This method, apart from being too verbose, was error prone, given an undesired `getheaders` would make tests pass. This adds the ability to check for a specific block_hash within the last `getheaders` message.