Add support_status doc for properties

[Gauvain Pocentek]

support_status information should be provided in the HOT reference. See https://review.openstack.org/#/c/116443/ for reference.

[Gauvain Pocentek (gpocentek)]

support_status for properties...

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/147434

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/147434
Committed: https://git.openstack.org/cgit/openstack/heat/commit/?id=144f5e49b96ad8bc6bab6e35e44e72af5c31475e
Submitter: Jenkins
Branch: master

commit 144f5e49b96ad8bc6bab6e35e44e72af5c31475e
Author: Steven Hardy <email address hidden>
Date: Thu Jan 15 09:41:57 2015 +0000

    Add support status to docs for properties

    I thought we already had this, but inspection of the generated docs
    reveals that we only do class-level docs for the support status,
    not exposing those defined in the schema.

    Adding the properties support status should help reduce user confusion
    when new properties are added between releases.

    Change-Id: I5f3228161e57daad73cbafc124c4fad05c68d3d6
    Closes-Bug: 1376868