Often the choice whether some particular message is displayed with
SAL_INFO or SAL_WARN has not necessarily been that well thought
through. Many SAL_WARNs are not actually warnings but purely
informative. If you want to see the INFOs for an area it makes sense
to want to see also the WARNs for it. So make it so, unless a specific
WARN selection is specified.

Change-Id: I6286c5f856b29e68bedb7f20efadf56953f94b72