Manage the %config() case in spec files

When the %config() macro was encountered in the packaging section of a
spec file, the file wasn't added to the package in the recipe. Also when
more than one macro was found before a file in the packaging section the
file would not be added (usually a %attr() and a %config() macro). This
patch correct both those issues.

Signed-off-by: Kévin THIERRY <kevin.thierry@open.eurogiciel.org>