base: Getting rid of /var/run & /run

I do appology for not having testing my code enough on previous commits.
This commit is closing this issue.

/var/run is now a symlink to ../run which is exactly what the pretrans
scriptlet from the package filesystem does.

Here come the view of the /var when this patch is activated.
lrwxrwxrwx  1 root root   11 août  21 10:21 lock -> ../run/lock/
lrwxrwxrwx  1 root root    6 août  21 10:27 run -> ../run/

The lock directory was already properly setup, the run is now also good.

If we do encounter some other problems with it, it just means that
something is wrong elsewhere.