update references and topics in keystone documentation

Registered by Joseph Heck

Update the keystone documentation
 - change references through-out from older "tenants" to "project" as a common term
 - update documentation concepts in general guides to explain/detail domains and groups
 - update reference documentation to outline extension points on keystone and deployment options to take advantage of external authentication and other options

Blueprint information

Status:
Complete
Approver:
Anne Gentle
Priority:
Low
Drafter:
Joseph Heck
Direction:
Approved
Assignee:
None
Definition:
Superseded
Series goal:
None
Implementation:
Started
Milestone target:
None
Started by
Tom Fifield
Completed by
Anne Gentle

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