Context

Replace some Printf.printf with Format.printf (redirected by Alcotezt to tezt's Logging) or by Tezt's Log.* functions directly.

Manually testing the MR

Run the modified tests with/without --verbose. No output should be visible without --verbose.

Document the interface of any function added or modified (see the coding guidelines)
Document any change to the user interface, including configuration parameters (see node configuration)
Provide automatic testing (see the testing guide).
For new features and bug fixes, add an item in the appropriate changelog (docs/protocols/alpha.rst for the protocol and the environment, CHANGES.rst at the root of the repository for everything else).
Select suitable reviewers using the Reviewers field below.
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Edited Oct 05, 2023 by Arvid Jakobsson