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Support Ganeti backends with Xen hypervisor:
* Extend 'Backend' model with the 'hypervisor' attribute, which
  currently can be 'kvm' or 'xen'. Use 'kvm' as default value to
  easy database migration. Also add the corresponding schema migration.
* Do not use hotplug at Xen backends, since it is not
  implemented.
* Support different 'hvparams' for Xen and KVM backends. Update
  GANETI_CREATEINSTNACE_KWARGS setting to hold 'hvparams' for both
  Xen and KVM.
* When getting instance console, check 'serial_console' hvparam only
  for Xen instances.

Refs #3772

New module implementing instance allocation to one of the available
backends. Allocation is performed based on memory and disk utilization.
Statistics for each backend are stored in DB and updated periodically.

Allocation can be customized by creating a new allocation strategy
and declaring it in BACKEND_ALLOCATOR_MODULE setting.

split out of some commonly used code in a seperate package

since more than one packages exist in repository root

Refs #1005

Refs #1005

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

Remove 36 lines of noise from all of settings.d configuration files.
Besides being utterly useless and extremely annoying, it's also commonly
incorrect since some of them are derived from Django and they're not
ours.

Make a dummy ModifyInstance call when changing instance 
tags in order to force process_net_status to be called on
the dispatcher.

Split settings.py.dist in distinct conf files under settings.d/,
similarly to:

https://code.djangoproject.com/wiki/SplitSettings#UsingalistofconffilesTransifex

Use settings..d/*-local.conf files for local modifications,
update .gitignore to ignore them.

Refs #693

* Removes piston dependency.
* Adds dateutil dependency.

Fixes #183 - Implement /servers
Fixes #185 - Implement /images
Fixes #245 - Details in exception handlers
Fixes #249 - Metadata handling
Fixes #253 - Transition to OpenStack API v1.1
Fixes #255 - Fix XML for addresses
Fixes #287 - Piston related bug
Fixes #289 - Support both XML and JSON
Fixes #309 - GUI not refreshing
Fixes #339 - Support API extensions
Fixes #359 - action returns serviceUnavailable
Fixes #361 - return dates with timezones
Refs #301 - Sanitization of API
Refs #315 - Replace API v1.1