pithos: change resource usage retrieval
Replace ``astakosclient.get_info()`` with ``astakosclient.get_quotas()``
pithos: remove dependency from synnefo.lib.queue.Receipt
Merge branch 'feature-quotas' into develop
Conflicts: docs/dev-guide.rst
Merge branch 'tmp-pithos-db-escape-warning' into develop
pithos: Remove unnecessary logging in public url unset
pithos: Remove obsolete settings from database migrations
Use astakosclient to retrieve user information
pithos: Update merged code
pithos: Update pithos management commands
Refs: #3625
pithos: Rename backend quotaholder properties
Refer to astakosclient instead of quotaholder
pithos: Utilize astakosclient for quota handling
Refs: #3625, #3650
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