- Switch vscan user/group to system-user-vscan package

- Skip nagios on Tumbleweed due to legacy cron script

- Add sysconfig file to allow for custom dccifd parameters
- Switch cleanup cron script to systemd service and timer
- Install binaries in proper libexecdir

- Update to 2.3.169:
* major version jump, reference CHANGES
- Replace SysV init script with systemd service unit file
- Switch to sysusers
- Package server components
- Modernize spec file