Removes trailing newline from /etc/fstab

Binary package hint: update-manager

The dist ugprader tarball includes the following:

        if replaced:
            logging.debug("writing new /etc/fstab")
            open("/etc/fstab.intrepid","w").write("\n".join(lines))
            os.rename("/etc/fstab.intrepid","/etc/fstab")

This will write a new copy of /etc/fstab _WITHOUT_ the final newline (it only puts newlines between the existant lines).

Removing the final newline means that the shell code in several places that tries to parse /etc/fstab will fail, in particular this will mean:

 - if the last entry is a swap partition, it will not be activated
 - if the last entry is an ordinary partition, it will not be checked (and may not be mounted!)
 - if the last entry is an NFS mount, it will not be mounted

While you could argue those are bugs in themselves, it would be nice if the dist-upgrader didn't cause them :p