NVIDIA / holodeck / 21996870985

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fix(sshutil): add mutex to TOFU known_hosts to prevent race condition (#644)

Concurrent SSH connections (during cluster provisioning) could race on
the known_hosts file read-then-write, causing duplicate entries or
inconsistent state. Add a package-level mutex around the callback.

Audit finding #13 (MEDIUM).

Signed-off-by: Carlos Eduardo Arango Gutierrez <eduardoa@nvidia.com>

3 of 3 new or added lines in 1 file covered. (100.0%)

2506 of 5270 relevant lines covered (47.55%)

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