[autotest] fix error |ImportError: No module named autotest_lib.client.common_lib|

import common should be added for the script to run on devserver.

BUG=None
TEST=None

Change-Id: Ie03f7af5dd70cf190969897fc871df3fb96fe264
Reviewed-on: https://chromium-review.googlesource.com/185608
Commit-Queue: Dan Shi <dshi@chromium.org>
Tested-by: Dan Shi <dshi@chromium.org>
Reviewed-by: Alex Miller <milleral@chromium.org>
1 file changed