Update HOT docs to reflect stack-metadata section

Registered by Tim Schnell

The HOT specification and documentation should be updated with information regarding the new reserved section stack-metadata. Including proposed use-cases and example syntax.

Blueprint information

Status:
Complete
Approver:
Steve Baker
Priority:
Medium
Drafter:
Tim Schnell
Direction:
Needs approval
Assignee:
Tim Schnell
Definition:
Obsolete
Series goal:
None
Implementation:
Needs Code Review
Milestone target:
None
Started by
Steve Baker
Completed by
Steve Baker

Related branches

Sprints

Whiteboard

Gerrit topic: https://review.openstack.org/#q,topic:bp/update-stack-metadata-spec,n,z

Addressed by: https://review.openstack.org/56703
    Updates HOT spec and guide for stack_metadata

As Zane pointed out, it would be more appropriate for this work to be done as part of blueprint namespace-stack-metadata

(?)

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