mail_notifier: Check for enabled smtp right before msmtp call and do not exit if smtp is not configured.

So we don't remove kernel modules installed by user.

When we find out we are on a development box, include even the logs of
the user packages form updater.

The pclose also waits for the process to terminate and cleans up the
zombie. The original caused hunted systems with thousands of zombies.

So don't try to revive it if it is not installed.

This util is moved from rtool repository.

Include 3-clause BSD licence headers to the tiny utilities.