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Use the python-objpool package for pooling resources as object, instead
of the pooling code that existed in snf-common ('synnefo.lib.pool')

Refs #3524

Remove this setting as it introduces unnecessary complexity. Also,
it will need to be supported by snf-astakos-client. If needed by
tests to bypass communication with astakos, a mocking library should
be used.

Common 'api_method' decorator, needs the ASTAKOS_URL setting to
authenticate with Astakos. Create this setting for Pithos based
on PITHOS_AUTHENTICATION_URL.

This Ganeti RAPI client has been moved to snf-cyclades-app.

Update all pithos API methods to use the new common 'api_method'
decorator. However, this decorator is not enough for pithos since
pithos methods require some extra tasks:
* Create a PithosBackend connection
* Handle special HTTP headers

For these reasons, pithos defines a custom 'api_method' decorator, which
is decorator by the common 'api_method' decorator.

Update all astakos API methods to use the new common 'api_method'
decorator. The 'api_method' decorator 'user_required' option
authenticates uses by their token through astakos. Consequently,
astakos methods can not use this option. Instead, two custom
decorator are implemented for astakos:
* user_from_token: Asserts that a user with the specified X-Auth-Token
  exists
* service_from_token: Asserts that a service with the specified
* X-Auth-Token exists.

Update Cyclades API methods to use the new common 'api_method'
decorator. Also, update all the relevant tests.

Use the common 'api_method' decorator in all plankton API methods.
Modify the 'plankton_method' decorator to only create and close
the ImageBackend.

Refs #3359

Handle these errors explicitly in the code instead of the "api_method"
decorator.

Create a single decorator for API methods to be used be accross all
synnefo. This decorator does the following:

* Proper logging of 5xx faults and unexpected errors
* Authentication with Astakos using snf-astakos-client
* Sets proper HTTP response and cache control headers

Also move some common functions from various apps to
'snf_django.lib.api.utils'

Refs #3358 #3448

Gather all faults from all synnefo projects into common
'snf_django.lib.api.faults'.

Create 'snf-django-lib', common Synnefo library for django.

Refs: #3519

Add a stamp database revision section in the guide.

Invite view and function had the same name.

The Integrator's Guide is outdated, keep it as a file,
but remove it from the documentation's index page.

Plankton backend raised AssertionError when an Image was not found.
Change this to raise faults.ItemNotFound error. Temporary commit
until common API decorator is implemented.

Refs #3356

Until now, deleting an image resulted in deletion of the corresponding
file from Pithos. Plankton Images are files in Pithos with special
metadata on the 'plankton' metadata domain. Adding an Image to plankton
is equivalent with adding some special metadata in this domain. In the
same way, this commit implements Image deletion by deleting these
metadata, and retaining the original file in Pithos.

Refs #3522

Do not use a default value (was "MAC_FILTERED") for "type" parameter of
"network_create" API method. The client must explicitly choose the
network type.