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Refs #3440

Most astakos-quotas calls use services' tokens

Refs #3440

Refs #3440

Refs #3440

All Exceptions that AstakosClient is raising should
be under AstakosClientException class

Refs #3440

Refs #3440

move astakos.im.synnefo_settings to astakos.synnefo_settings and make
the appropriate changes in setup.py

Conflicts:
	snf-astakos-app/astakos/im/api/service.py
	snf-quotaholder-app/quotaholder_django/quotaholder_app/callpoint.py

Conflicts:
	docs/older/Changelog.pithos-app
	snf-astakos-app/astakos/im/api/__init__.py
	snf-pithos-app/pithos/api/util.py

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

use the new synnefo.user method `get_username` to populate
personal/shared images.

An unevaluated query ends up being used as an argument of intended list
type to another query, which fails in the case of an EmptyQuerySet, which
is not iterable.

kvm-vif-bridge is provided by snf-network. Remove it from the synnefo
repo to avoid confusion.

Prefetch all holdings required for update with a specified order
(by entity/resource pair).

Refs #3560

landing instead of user profile