Command line doesn't display some error messages

[Liusheng]

The following bug reported a similar problem:

https://bugs.launchpad.net/python-ceilometerclient/+bug/1260394

but this bug has only handled the HTTPBadRequest error, it is not all-inclusive.

if I using following commands:

ceilometer alarm-combination-create --alarm_ids abc --name test_alarm

The CLI just return ：HTTPNotFound (HTTP 404)

it dosen't display the error message.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/83028

[Openstack Gerrit (openstack-gerrit)]

Reviewed: https://review.openstack.org/83028
Committed: https://git.openstack.org/cgit/openstack/python-ceilometerclient/commit/?id=317ce85f2106223f0b06e054a71e0e9b498d0b69
Submitter: Jenkins
Branch: master

commit 317ce85f2106223f0b06e054a71e0e9b498d0b69
Author: liu-sheng <email address hidden>
Date: Wed Mar 26 18:28:45 2014 +0800

    Display message on HTTPException

    Display the faultstring of HTTPException if available, such as
    HTTPBadRequest(400) error and HTTPNotFound(404) error.

    Change-Id: I1c361ff5d02ded4af429f94fd4299d2de3798488
    Closes-bug: #1297769