Race Condition In ./fsim Tests

[ben-krieger]

Nature of the bug

Flaky test due to date printing twice to stdout.

Steps taken to find bug

Detected in CI run: https://github.com/fido-device-onboard/go-fdo/actions/runs/12360006218/job/34493938771

Steps to ensure bug is gone

Run tests for awhile with while go test -v -failfast ./fsim; do :; done

Logs

2024-12-16T19:38:56.4293085Z === NAME  TestClientWithCommandModule
2024-12-16T19:38:56.4293484Z     fsim_test.go:296: expected stdout to be integer epoch time, got 
2024-12-16T19:38:56.4293770Z         1734377936
2024-12-16T19:38:56.4293935Z         1734377936
2024-12-16T19:38:56.4294422Z          (err strconv.Atoi: parsing "1734377936\n1734377936": invalid syntax)