Base service url should return version information

Registered by Adrian Turjak

The '/' url for the service should return a json of the available API versions that the service has much in the same way Keystone does.

Some support for this would need to be built into the client, but not too much until a new version actually exists.

References:
https://wiki.openstack.org/wiki/VersionDiscovery
https://docs.openstack.org/keystoneauth/latest/using-sessions.html#major-version-discovery-and-microversion-support

Blueprint information

Status:
Complete
Approver:
None
Priority:
Undefined
Drafter:
Adrian Turjak
Direction:
Needs approval
Assignee:
Amelia Cordwell
Definition:
Review
Series goal:
None
Implementation:
Implemented
Milestone target:
None
Started by
Adrian Turjak
Completed by
Adrian Turjak

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