device-crash-test: No need for sys.path hack

The device-crash-test script is already inside the 'scripts'
directory, there's no need to add the directory manually to
sys.path.
Signed-off-by: NEduardo Habkost <ehabkost@redhat.com>
Message-Id: <20180618225131.13113-2-ehabkost@redhat.com>
Reviewed-by: NDaniel P. Berrangé <berrange@redhat.com>
Reviewed-by: NStefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: NEduardo Habkost <ehabkost@redhat.com>

scripts/device-crash-test

@@ -35,7 +35,6 @@ import random
 import argparse
 from itertools import chain
 
-sys.path.append(os.path.join(os.path.dirname(__file__), '..', 'scripts'))
 from qemu import QEMUMachine
 
 logger = logging.getLogger('device-crash-test')