logging: eliminate out-of-range dout calls

logging: eliminate out-of-range dout calls

Eliminate calls to dout that use non-existent log levels, like negative
levels less than -1. Also trigger a compiler error in the future if they
get re-added. -1 is the highest priority dout level; putting lower
priorities into the output buffer will just cause errors.

Signed-off-by: Colin McCabe <colinm@hq.newdream.net>