hack/make: suppress "not mounted" message

The "not mounted" error from .integration-daemon-stop is not an error,
so let's suppress that one (this is the only effect of -q option, at
least according to its man page).

Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>

hack/make/.integration-daemon-stop

@@ -15,7 +15,7 @@ if [ ! "$(go env GOOS)" = 'windows' ]; then
 		fi
 		root=$(dirname "$pidFile")/root
 		if [ -d "$root" ]; then
-			umount "$root" || true
+			umount -q "$root" || true
 		fi
 	done