Admins cannot access the default pool through the API

[Betsy Luzader]

A Designate admin is not able to access the default pool through the public API calls. The default pool is created with a tenant_id of null. The query to GET the pool does not match the 'WHERE tenant_id is ?' clause, so it does not result in a match.

The fix is to modify the _apply_tenant_criteria method in the designate/sqlalchemy/base.py module to also accept tenant_id = NULL.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/134653

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/134653
Committed: https://git.openstack.org/cgit/openstack/designate/commit/?id=813843bd366933224e65e54519ba0a3eb08dd8c3
Submitter: Jenkins
Branch: master

commit 813843bd366933224e65e54519ba0a3eb08dd8c3
Author: Betsy Luzader <email address hidden>
Date: Fri Nov 14 15:13:51 2014 -0600

      Can't Access Default Pool through API

      Since the default pool had a tenant_id = Null, not even an
      admin could access it through the API. This fixes that.

      Closes-Bug:#1392748

    Change-Id: I5238b119ee62dc168ac3bfc5875619c1e07eac60