virttest: Add parameter to control log level.
Initial effort to add the parameter "--log-level" when running tests,
to control the log level. For example:
./run -t qemu --log-level=error
Will only log ERROR messages.
Note that The default value remains DEBUG level.
Currently it only applies to log/debug.log.
Signed-off-by: NRuda Moura <rmoura@redhat.com>
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