support image community visibility

Registered by Su Zhang

Add a new feature to the v2 API which allows a user to share an image with all
other tenants. These "community" images do not appear in image listings for a
user until that user has accepted the image. This allows image owners to
easily make images available to a wide community of users, without the burden
of manually sharing these images with each individual user.

This new feature adds a new value for the visibility of an image to the
underlying data model, named ``community``.
This BP is based on an existing one at https://wiki.openstack.org/wiki/Glance-v2-community-image-sharing-use-cases#.281.29_Create_a_community_image
Continue work is needed as the previous owner has left without a full implementation.

Blueprint information

Status:
Not started
Approver:
None
Priority:
Undefined
Drafter:
Su Zhang
Direction:
Needs approval
Assignee:
Su Zhang
Definition:
Review
Series goal:
None
Implementation:
Unknown
Milestone target:
None

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