shell/caucase.sh: Make caucased verbose in tests.

Tests are supposed to help spot errors, and caucased access traces help
with this too.

shell/caucase.sh

@@ -1212,12 +1212,12 @@ EOF
     echo 'Starting caucased...'
     case "$caucased_type" in
       path)
-        caucased --netloc "$netloc" > /dev/null &
+        caucased --netloc "$netloc" &
         ;;
       environment)
         "$CAUCASE_PYTHON" \
           -c 'from caucase.http import main; main()' \
-          --netloc "$netloc" > /dev/null &
+          --netloc "$netloc" &
         ;;
       *)
         echo "Unhandled caucased_type $caucased_type"