Full content export and import per tenant

[hannahfrost]

Required to allow full system backup and restore. Required to allow movement of tenants between stacks or between hosting providers. Required to allow for hand-off of content on tenant exit. Required for service exit strategy.

[hannahfrost]

Use cases and related notes on the status of Fedora import/export work can be found: https://docs.google.com/document/d/1jmmMamWhdmMwuv7OmPKorzwBo5m5m7lEafhCQ2YqIIU/edit?usp=sharing

See also: https://wiki.duraspace.org/display/FF/Design+-+Import+-+Export

[CCMumma]

Indicated as a requirement for the Texas Digital Library Hyku pilot (February-July 2018) partners.