tests: support QTEST_TRACE env variable
When debugging failing qtests it is useful to be able to turn on trace
output to stderr. The QTEST_TRACE env variable contents get injected
as a '-trace <str>' command line arg
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <
20220310171821.
3724080-4-berrange@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>