Waldur-core

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- Migration to DRF 3.1 framework for REST, more consistent API.

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- Bugfixes.

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- Extended IaaS template filtering.
- Extended IaaS template with os_type and icon_name fields.
- Renamed 'hostname' field to 'name' in Instance and Resources.

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- Refactored OpenStack backups to use snapshots instead of full volume backups.
- Moved OpenStack credentials to DB from configuration. Old credential format is still supported.
- Added support for TZ in backup schedule definition.
- Introduced throttling for background tasks.

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- Introducing new quotas module prototype. Support for backend and frontend quotas.
- Introducing new template module prototype. Support for multi-service templates.
- Support for default availability zone of OpenStack deployment in configuration.
- Support for setting CPU overcommit ratio for OpenStack versions prior to Kilo.
- Change OpenStack tenant name generation schema. Now it uses only project UUID, name is removed.
- More resilient start/stop operations for OpenStack.
- Extended event log information for instance creation.
- Bugfixes.

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- Enhanced support of instance import - added ability to set template.
- Fix sorting of instances by start_time.