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Note that a database migration is needed.

Detect the following problems:
 * Detect stale DB servers without corresponding Ganeti instances
 * Detect orphan Ganeti instances, without corresponding DB entries
 * Detect out-of-sync operstate for DB entries wrt to Ganeti instances
Fix them as follows:
 * Simulate server deletion for stale DB servers
 * Issue RAPI DeleteInstance() call for orphan Ganeti instances
 * Set operstate in DB as in Ganeti for out-of-sync DB servers

See ./manage.py reconcile --help for more info, refs #1021.

Replaced send_async with django native send_mail
function.

 * Include file-based logging in /var/log/synnefo/dispatcher.log
   for the dispatcher in the default configuration.
 * Have the dispatcher redirect stdout and stderr file descriptors
   to the first file-based logfile.
 * Add a few log entries wrt dropped AMQP connections

Remove any reference to the synnefo.ganeti Django app
from the Django project, update README.upgrade accordingly.

-Use Django's DEFAULT_FROM_EMAIL configuration setting instead of custom setting
-Send invitations from the DEFAULT_FROM_EMAIL account

Make RAPI CreateInstance() arguments deployment-specific.
Add the GANETI_CREATEINSTANCE_KWARGS setting, which allows the administrator
to set arbitrary arguments to RAPI CreateInstance().

Also add initial version of README.Upgrade, detailing
upgrades of Synnefo deployments.

Fixes #835