insane.bbclass: Start to rework this so specific checks can be easily made warnings/errors

This patch means the warning/error handling can be controlled from local.conf
and/or from the distro level and no longer uses numbers but strings instead.

The system becomes extensible so that other classes can extend the path QA
checks at least.

It also removes all th duplicate error message code, we should have *one*
good error message.

Much work remains including making INSANE_SKIP take the classes of QA test
to skip but its a start.

(From OE-Core rev: 0fbe849b56d6457b6547a1202c4938d35316d8b8)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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