* remove upgrade handling for version 3.0.21 or older packages. Also fix #726
* added user.action, user.filter and user.trust files to conffiles (might be modified by user on running system)
* move permission setting from Makefile (install) to initscript because permissions are overwritten during/inside buildroot

Signed-off-by: Christian Schoenebeck <christian.schoenebeck@gmail.com>