The big change here is the rewrite of config-bisect. The old way never
worked properly as it assumed the bad config was a subset of the good
config, and just found the config that would break the build.

The new way does a diff of the bad config verses the good config and makes
the similar until it finds that one config works and the other does not
and reports the config that makes that difference. The two configs do
not need to be related. It is much more useful now.
ktest: Update documentation on config_bisect

With the more robust config_bisect, the documentation is out of
date and needs to be updated.

The new rewrite allows for finding missing configs and such, and
is much more robust to use.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
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