Stack pagination supports sorting by any column in the stack table

[Steve Baker]

The allowed sort_keys should really be limited to a known list of indexed columns. Initially this list should probably be:
stack.created_at
stack.updated_at
stack.name
stack.status

This might be best enforced in api.stack_get_all_by_tenant

[Steve Baker (steve-stevebaker)]

See bug #1252115 for the task to created the indexes for these columns

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/57339

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/57339
Committed: http://github.com/openstack/heat/commit/7f638afb06d2b85db26cdfd13c20436574dbbb3a
Submitter: Jenkins
Branch: master

commit 7f638afb06d2b85db26cdfd13c20436574dbbb3a
Author: Richard Lee <email address hidden>
Date: Tue Nov 19 16:30:22 2013 -0600

    Restrict sort_keys for stack lists

    We are only allowing users to sort stacks on a subset of columns that
    are known to be indexed. Currently allowed sort columns are:

    created_at
    updated_at
    name
    status

    Change-Id: Ib4f955336edd7d86a1b6bf98e38378b0d495d0dd
    Closes-Bug: 1252116