Remove admin checks from database layer

[andersonvom]

There are admin checks inside the database layer (heat/db/sqlalchemy/api.py) that should be performed elsewhere.

It looks like this admin check is being used only in one place (EngineService#_check_stack_watches in heat/engine/service.py) and was meant to be a quick fix for another feature.

The DB layer should be concerned with data retrieval only.

[Clint Byrum (clint-fewbar)]

Agreed, thanks for the bug report!

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/54395

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/54395
Committed: http://github.com/openstack/heat/commit/3dead2a0811d83b701ad2d9aac9713b2f426d256
Submitter: Jenkins
Branch: master

commit 3dead2a0811d83b701ad2d9aac9713b2f426d256
Author: Anderson Mesquita <email address hidden>
Date: Wed Oct 30 14:11:33 2013 -0500

    Rename admin flag on SqlAlchemy#stack_get

    The `admin` flag was only used to avoid doing a tenant_id check between
    the stack and the context.tenant_id, so it was renamed to `tenant_safe`
    for better clarity.

    Change-Id: I32c1156c8782bad39a265c77aad088c96400f69f
    Closes-Bug: 1245952