yocto-check-layer: disregard checks if referencing another README file
It is permissible to have a layer's README reference another README. If
this is the case, avoid other checks. Do this by checking for the word
README (case insensitive) in the README file. This might be too
permissive, but follows the pattern of looking for exact words (like
"patch" or "maintainer") in READMEs.
Signed-off-by: Jon Mason <jdmason@kudzu.us> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
