Setting tag sfa-4.0-0

Setting tag sfa-4.0-0
expose geni_api_versions as https://
avoid publishing non-relevant entries in GetVersion
fixes in the IoT-lab driver (thanks Loic)
reviewed logging policy, less awkward and more reliable; /var/log/sfa{,-import}.log should now be alive and time rotate
rewrote init-style startup script into systemd-native services: sfa-aggregate and sfa-registry, that both depend on sfa-db
huge cleanup, removed everything related to init.d; debian; flash-policy; max aggregate; federica, openstack/nova and nitos drivers