For run_remote_tests this required "fixing" restart_in_chroot if required. Right now that script ->only<- works if its run on a scripts being called from src/scripts. This change makes it more generic by doing this for any script called from within our source tree.
I borrow reinterpret_path_for_chroot from image_to_live. Other CL to remove it from there.
Change-Id: If717beccd777ac178366d58b91521b9a62d55d85
BUG=chromium-os:11172
TEST=Ran them
Review URL: http://codereview.chromium.org/6730012