Spec Lite: Remove the Images API v1

problem: The Images API verison 1 was DEPRECATED in the Newton release: https://docs.openstack.org/releasenotes/glance/newton.html It needs to be removed from the codebase.
dependencies: The copy_from import-method must be implemented and the Images API version 2.6 must be CURRENT. (That's because the key requested feature missing from Images v2 is a copy-from functionality.)
solution: This will require some preliminary work before the code is removed, for example, removing any Tempest tests that use the v1 API. These will be noted as "Work Items" on the Blueprint.
how: Remove all v1 tests, remove v1 endpoints from Images API, remove glance-cache-manage command that is still relying fully on v1 API. Gradually clean out the v1 code base that's left behind.
impacts: DocImpact (All v1 docs will have to be removed)
timeline: target for the Q-3 milestone (week of 22 January 2017)
link: https://blueprints.launchpad.net/glance/+spec/remove-v1
reviewers: all core reviewers
assignee: jokke