shell/caucase.sh: Make test failues easier to debug.

shell/caucase.sh

@@ -1210,12 +1210,12 @@ EOF
     echo 'Starting caucased...'
     case "$caucased_type" in
       path)
-        caucased --netloc "$netloc" > /dev/null 2> /dev/null &
+        caucased --netloc "$netloc" > /dev/null &
         ;;
       environment)
         "$CAUCASE_PYTHON" \
           -c 'from caucase.http import main; main()' \
-          --netloc "$netloc" > /dev/null 2> /dev/null &
+          --netloc "$netloc" > /dev/null &
         ;;
       *)
         echo "Unhandled caucased_type $caucased_type"