redirect stdout+stderr of `userdel`

If no mail-spoolfile exists for the user the error reporting was
visible in the cdist-run.

cdist/conf/type/__user/gencode-remote

@@ -135,10 +135,10 @@ elif [ "$state" = "absent" ]; then
     if grep -q "^${name}:" "$__object/explorer/passwd"; then
         #user exists, but state != present, so delete it
         if [ -f "$__object/parameter/remove-home" ]; then
-            echo userdel -r "${name}"
+            printf "userdel -r %s >/dev/null 2>&1\n" "${name}"
 	    echo "userdel -r" >> "$__messages_out"
         else
-            echo userdel "${name}"
+            printf "userdel %s >/dev/null 2>&1\n" "${name}"
 	    echo "userdel" >> "$__messages_out"
         fi
     fi