crush/CrushCompiler: make current set of tunables 'safe'

We can reenable this error the next time we add new tunables.

Signed-off-by: Sage Weil <sage@inktank.com>
crush: add indep data set to cli tests

This will help us catch things if we break the mapping.

Signed-off-by: Sage Weil <sage@inktank.com>