Shift crosutils scripts to use the common.sh they were written against.

Rather than trying to use an old/stale common.sh, use the common.sh
from the invocation point- if invoked via /usr/lib/crosutils, use that
common.sh.  If invoked via src/scripts/, use that, etc.

Trying to intermix it just introduces potential for bugs and invalidly
freezes common.sh api, thus the efforts to revert this and ultimately
revert the existing of a crosutils ebuild.

BUG=chromium-os:27201
TEST=cbuildbot x86-generic-full

Change-Id: I4c6c5fbade3d28c71752bd4c44dccad49af52ec0
Reviewed-on: https://gerrit.chromium.org/gerrit/18303
Reviewed-by: David James <davidjames@chromium.org>
Commit-Ready: Brian Harring <ferringb@chromium.org>
Tested-by: Brian Harring <ferringb@chromium.org>
19 files changed