packaging: spec: own directories

avoid to leave empty directories around when removing the rpm
from the system, owning all directories used by the package.
Simplified the spec file using directory recursion
in file section.

Change-Id: I6fa5fa5d301071adb2601089db3741c0c8404d68
Signed-off-by: Sandro Bonazzola <sbonazzo@redhat.com>