tests: dont't timeout flock

tests: dont't timeout flock

The only situation where we would block endless is if another parallel test
has the lock and hangs for another reason. This means that the other test
would still keep hanging even if we timeout here. The user would have to
interrupt the other test or the whole test-suite anyways.

Note that we would certainly run into any timeout when using --parallel=200,
so that all scsi tests start the same time.

Signed-off-by: Ruediger Meier <ruediger.meier@ga-group.nl>