packaging: own config directory

Ensure that the configuration directory are created
on the system and owned by the rpm package.
Avoid to create manually those directory when copying
the config files to another host where this package
is already installed.

Change-Id: Ib6a6aef07e1dca4fdbc175dcf4ea002016437b7a
Signed-off-by: Sandro Bonazzola <sbonazzo@redhat.com>