We want to be able to reuse most this functionality for the file
checksum cache.
(Bitbake rev: 0fe3cb1438d297f90dd0fc6b26362ecbff75c76d)
Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>