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Move NetworkReconciler class from network-create command to
reconciliation module.

Refactory network reconciliation. Implement NetworkReconciler class to
hold all reconciliation functions.

Backend allocator excludes backends that do not have a free IPv4
address. Since, from now on, not all instances are connected to a public
network, this check is only needed when 'SNF:ANY_PUBIC' network is used.

Do not issue commission for public networks, since they do not have an
owner.

Create tests module to hold all tests for logic.

Move code checks from network-create management command to
logic/networks.py.

Also create common decorator for management commands to convert api
faults to command errors.

Add tests to check creation and usage of IPv6 only networks. Tests also
cover creation of other type of networks.

Make Cyclades support IPv6 only networks. Such networks will have
the 'subnet' attribute set to None, in the same way that IPv4 only
networks have the 'subnet6' attribute set to None.

Because currently Ganeti does not support IPv6 only networks, we create the
corresponding Ganeti network with a dummy IPv4 subnet(10.0.0.0/24) that will be
never used, since Cyclades will connect instances to IPv6 networks with
'address' attribute set to None.

Sort list before comparing, since ordering in the response data is
not specified. Triggered when run with postgres.

Substitute debug statements with a backend method decorator
which registers the method execution arguments, the return values
and the exceptions occured.

Some data migrations require to import pithos app settings.
These migrations used to fail in nodes where snf-pithos-app
is not installed.
Disable these migrations if they fail to import the necessary settings.

Plankton returns properties whereas Cyclades returns
metadata for the images.

With this flag one can specify the owner of the
system images.
Currently one has to specify owner's uuid.
This options is mandatory.

Conflicts:
	Changelog
	snf-astakos-app/astakos/im/messages.py
	snf-astakos-app/astakos/im/views/target/__init__.py
	snf-cyclades-app/synnefo/logic/backend.py
	snf-cyclades-app/synnefo/logic/management/commands/reconcile-servers.py
	snf-pithos-backend/pithos/backends/lib/sqlalchemy/node.py
	snf-pithos-backend/pithos/backends/lib/sqlite/node.py

How vm connection user gets resolved:

- Use the last user in `users` vm metadata if exists
- Use the last user in `users` vm image metadata if exists
- Use root if vm's image osfamily metadata is Linux
- Use Administrator if vm's image osfamily metadata is windows

Add hardcoded 'default' value in region attribute.

Refs #4086

The newly created attributed used to point in the source node
instead of the destination

Refs: 3510

- Customized logout success message
- Customized add prompt message

use libguestfs naming convention

redhat -> rhel
suse -> opensuse (also cloned as sles)

Make the pool size of the pithos backends a configurable setting,
namely PITHOS_BACKEND_POOL_SIZE.

This method optionally accepts a user paramter and used to return
the objects shared to the user and having a specific domain.
This commit extends this functionality and returns also the objects
owned by the user and having the specific domain

Refs: #3510

Improve performance

Refs: #3510

Before it used to query the database
for all the objects having the specific domain
and finally filtered out the objects to which the user had no access.
Now gets first the allowed_paths for the user and then
brings those having the specific domain

Refs: #3510

In commit 9f135224edf6e50386dc29e0a35806a92c56a50c
the transaction management has been moved
from the pithos backend to pithos frontend.
This commit updates all modules use pithos backend
to handle transactions manually.

This reverts commit 02c1f22a0f7396a7b2211677db78247586e10805.