Ganeti 2.8 design

The following design documents have been implemented in Ganeti 2.8:

• Ganeti reason trail
• Instance auto-repair
• Design for adding UUID and name to devices

The following designs have been partially implemented in Ganeti 2.8:

• Management of storage types and disk templates, incl. storage space reporting
• HRoller tool
• Splitting the query and job execution paths: everything except instance queries.
• Partitioned Ganeti: “Constrained instance sizes” implemented.
• Ganeti monitoring agent: implementation of all the core functionalities of the monitoring agent. Reason trail implemented as part of the work for the instance status collector.