Use config file instead of hardcoding values.
vps-lib.sh : pull API_URL from config
sync-ganeti-files.sh : sync /home/iso
sync-auth-keys.sh : fetch manager from config and use for syncing
make-vps.sh : read config values from file. configure if a secondary node is used. configure if nodes are balanced on freespace or not
make-access-files.py : read config file. add ssh key parsing input validation.