Lower the log level in tests

The subunit output size is already nearing 50MB, which is the maximum
allowed by jenkins jobs. Lower the log level to INFO, which should be
enough for normal test runs and lower the output size significantly.

Co-Authored-By: Joshua Hesketh <josh@nitrotech.org>
Change-Id: Ia6adc28a7bda482595df4b5f3b144f150e3a441e
1 file changed