Add extra_info field for the response of protectable instances API

Registered by chenying

We can only query the id, name and type of protectable instance using the restfull API
of protectable instance. We can not get more info about the resource instance.
Some other info about instance is also needed when we protect resources with different
resources type.
For example: database instance. only the name of database instance is not enough. The
host ip, the database system name about the instance are also needed.

Blueprint information

Status:
Complete
Approver:
None
Priority:
Medium
Drafter:
chenying
Direction:
Needs approval
Assignee:
None
Definition:
New
Series goal:
Proposed for pike
Implementation:
Implemented
Milestone target:
milestone icon pike-ms
Started by
chenying
Completed by
chenying

Related branches

Sprints

Whiteboard

Gerrit topic: https://review.openstack.org/#q,topic:bp/instances-extra-info,n,z

Addressed by: https://review.openstack.org/387302
    The spec about adding extra_info field to the response of instances API

Addressed by: https://review.openstack.org/388593
    Add extra_info field to the response of instances API

Addressed by: https://review.openstack.org/390471
    Add extra_info field to the resource database table of plan API

Addressed by: https://review.openstack.org/390613
    Add extra_info field to the resource database table of plan API

Gerrit topic: https://review.openstack.org/#q,topic:bp/resource-db-extra-info,n,z

Addressed by: https://review.openstack.org/457161
    Updata the api doc about the extra_info filed of protectable API

(?)

Work Items

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