Comment 2 for bug 1816105

Patches the work towards this initiative:

Recursive deletion and project disabling: https://review.openstack.org/148730 (merged)
API changes for Reseller: https://review.openstack.org/153007 (merged)
Add parent_id to GET /projects: https://review.openstack.org/166326 (merged)
Addressed by: https://review.openstack.org/243584 (merged)
Manager support for project cascade update: https://review.openstack.org/243584 (merged)
API support for cascade update: https://review.openstack.org/243585 (abandoned)
Manager support for project delete cascade: https://review.openstack.org/244149 (merged)
API support for project cascade delete: https://review.openstack.org/244248 (abandoned)
Add backend support for deleting a projects list: https://review.openstack.org/245916 (merged)
Test list project hierarchy is correct for a large tree: https://review.openstack.org/277512 (merged)
Fix cascade operations documentation: https://review.openstack.org/274836 (merged)
Revert "Fix cascade operations documentation": https://review.openstack.org/286716 (merged)
Remove the APIs from doc that is not supported yet: https://review.openstack.org/368570 (merged)