bug#27146: system init: if /etc doesn't exist, create it

[ng0 <ng0@pragmatique.xyz>]

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I had the unfortunate experience of remote fixing a system,
and one way I tried to fix my original problem was to
remove the /etc directory (this included the content of
debian 8 with some alternative changes to the minimal
one I did not set up myself).
When I rebooted, this is still at activation of the first
system generation, I get the repl because the symlink
target does not exist (obviously).

We should think of such situations, however uncommon they are,
and check if /etc exists. If it doesn't exist create it
otherwise it is assumed that it exists and for example
this symlink creation will work: ssl -> /run/current-system/profile/etc/ssl

-- 
ng0
OpenPG: A88C8ADD129828D7EAC02E52E22F9BBFEE348588

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