Copy configs from /etc-target to /etc on target phase

Mathieu Parentrequested to merge
sathieu/images:master into master

This is needed when package has dependencies in experimental.

Example for samba:

before_script:

  • echo 'deb http://deb.debian.org/debian experimental main' > /etc/apt/sources.list.d/experimental.list
  • "echo 'Package: ldb-tools libldb* python*-ldb*\nPin: release a=experimental\nPin-Priority: 500' > /etc/apt/preferences.d/experimental.pref"

Fixes: pipeline#24 (closed).

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