Cluster allocation tools for Ganeti

 These are additional tools used for enhanced allocation and capacity
 calculation on Ganeti clusters.
 .
 The tools provided are:
   - hail, an iallocator script for ganeti
   - hbal, used to redistribute instances on the cluster
   - hspace, used for capacity calculation
   - hscan, used to gather cluster files for offline use in hbal/hspace
   - hroller, used to calculate rolling maintenances