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Change condition for being compatible with django 1.2 or greater

Refs: #4063

Check the process exitcode to determine if a process finished
successfully.

Speed up reconciliation by using mulitprocessing to get in parallel
the instances from all Ganeti backends.

* If there is no next request parameter, the view fails with 400
(BadRequest) response status.
* ``pithosdev`` added in allowed schemes for the next parameter

Before public listing (public request parameter)
requested by non path owners, was ignored.
Now it returns a response with 403 status code (Forbidden)

Conflicts:
	version

Fix deadlock between snf-dispatcher and backend allocator, by making
snf-dispatcher take an exclusive lock to the backend which hosts the vm,
before trying to get the exclusive locks to the IP pools in order to
reserve and release the instance IPs.

astakosclient should be added to the beggining of the sys.path instead,
of the end, since astakosclient may already be installed on the system.

to match the updated snf_django api_method decorator

allow API views to define supported serializations.

Set CONNECTION_RETRY_LIMIT=2 for the PithosClient

After all, the prefix is visible to users as part of the public url
they pass around, therefore 'public' is much more presentable than
pithos_public.

since django 1.3, when using the ``transaction.commit_manually`` decorator,
transaction is required to be closed (using either commit/rollback) even if
only read db operations are executed from within the wrapped method.

Conflicts:
	snf-astakos-app/astakos/im/messages.py
	snf-astakos-app/astakos/im/settings.py
	version

Compute account statistics instead of storing them in the database
Fix container statistics computation
Related commit: 3a9f1f113c1e2c853b7ae223fbcbb843d19f7f95

To achieve atomicity we lock the container path.
However, the write operations update the statistics for the ancestor
nodes (container/account).
Therefore, the backend restricts the recursion up to the container
level.
Account statistics should be computed whenever are required.

Refs: #3582 #3585

Dummy implementation of /extensions/<alias> endpoint that always returns
404.