A modest number of different scripts and files have a usage
restricted to build_image. Move those files to build_library,
to prevent them accumulating unwanted clients.
BUG=chromium-os:17390
TEST=build_image
TEST=grep relevant sources for references to all the files
Change-Id: I3e9f6447ec34c09ea2d61f29ac343386a1e122b9
Reviewed-on: http://gerrit.chromium.org/gerrit/4762
Reviewed-by: Richard Barnette <jrbarnette@chromium.org>
Tested-by: Richard Barnette <jrbarnette@chromium.org>
