autotest: allow a non-lockable packet_capture host

BUG=None
TEST=python
import common
from autotest_lib.server import packet_capture
with packet_capture.PacketCaptureManager() as capturer:
    capturer.allocate_packet_capture_machine(hostname='my_capture_host')
capturer.start_capture(freq=2437)
capturer.stop_capture()

Change-Id: Id3d950a5a2796cf9ae247863794ee0c1cf946cc4
Signed-off-by: Jason Abele <jabele@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/65894
Reviewed-by: Kris Rambish <krisr@chromium.org>
1 file changed