kern-tools: unify meta directory detection

It is possible that recipe specific tasks, or build processes drop
files into the kernel source directory. These files can cause problems
with the meta data detection in the kern-tools.

With this change, we have a single unified meta data detection routine,
that logs the result in a new file ".metadir", which subsequent scripts
can find, and use, thereby avoid repeating the same check many times.

We also enhance the check to look for a sentinel file in a proper meta
directory, to avoid false positives when an unexpected kernel process
leaves an uncommitted directory in the kernel dir.

[YOCTO: #7441]

Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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