heat-keystone-setup shall quit, when fail to get tenant_id

[DennyZhang]

When run heat-keystone-setup to enable heat, I encounter below problem.
,-----------
| [root@control ~(keystone_admin)]# /usr/bin/heat-keystone-setup
| /usr/bin/heat-keystone-setup
| 'NoneType' object has no attribute 'has_service_catalog'
| Using the OS_PASSWORD for the SERVICE_PASSWORD.
| ADMIN_ROLE 95d3ef28a0d7488eaa99acf95576afc2
| SERVICE_TENANT
| SERVICE_PASSWORD 9d278a0b5fcc4f4e
| SERVICE_TOKEN 672d35ceb6c1452fb6f0960c3601c541
| SERVICE_HOST 192.168.209.131
| ...
`-----------

After some trouble shooting, the problem is caused by the failure of
"keystone token-get".
,-----------
| [root@control ~(keystone_admin)]# keystone token-get
| keystone token-get
| WARNING: Bypassing authentication using a token & endpoint (authentication credentials are being ignored).
| 'NoneType' object has no attribute 'has_service_catalog'
`-----------

This means keystone_setup function in heat-keystone-setup fail to get the tenant_id.
But the script keep going, with this serious problem.

Before making the problem more complex, we'd better quit the script for this severes problem.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/61905

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/61905
Committed: https://git.openstack.org/cgit/openstack/heat/commit/?id=88b8e20f1ce367a3affefe20c45a1708e8a06bc3
Submitter: Jenkins
Branch: master

commit 88b8e20f1ce367a3affefe20c45a1708e8a06bc3
Author: DennyZhang <email address hidden>
Date: Thu Dec 12 19:30:41 2013 -0600

    add assertion to heat-keystone-setup script

    Defensive check for various critical steps in the script

    Change-Id: I9df01011940d80532787c3acaf0cc8ec10e97cc8
    closes-bug: #1260561