ironicclient should display the faultstring returned from api

[jiangfei]

ironic-api
 curl -i -X GET http://192.0.2.1:6385/v1/nodes/1278a5d7-726a-4f36-b2ed-0807f2bcefb1 -H "User-Agent: python-ironicclient" -H "Content-Type: application/json" -H "Accept: application/json" -H "X-Auth-Token:ca094934f87148f99645a51ed8c67fe9"
HTTP/1.0 404 Not Found
Date: Tue, 16 Dec 2014 03:01:05 GMT
Server: WSGIServer/0.1 Python/2.7.6
Content-Type: application/json
Content-Length: 153

{"error_message": "{\"debuginfo\": null, \"faultcode\": \"Client\", \"faultstring\": \"Node 1278a5d7-726a-4f36-b2ed-0807f2bcefb1 could not be found.\"}"}

when ironicclient use the HTTPClient, ironic node-show invalid uuid of node. we get the bleow message:

~/ironic# ironic node-show 6cabe4d8-66e4-4598-a614-77a8478d1ad1
Node 6cabe4d8-66e4-4598-a614-77a8478d1ad1 could not be found. (HTTP 404)

but when ironicclient use SessionClient, we get the bleow message:
# ironic node-show a938513a-216a-49dc-b801-08119ebc2b21
Not Found (HTTP 404)

ironic should return the faultstring to user.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/142021
Committed: https://git.openstack.org/cgit/openstack/python-ironicclient/commit/?id=9f919eed63a95ecbc8d43929c4e81c9f0693ddfb
Submitter: Jenkins
Branch: master

commit 9f919eed63a95ecbc8d43929c4e81c9f0693ddfb
Author: jiangfei <email address hidden>
Date: Tue Dec 16 15:35:53 2014 +0800

    ironicclient handle faultstring when using SessionClient

    When the ironic-api returns an error code 400-600 when,
    SessionClient faultstring did not return to the user,
    it should return a detailed error message to the user,
    not simply bad request.

    we use the ironic node-show aa938513a-216a-49dc-b801-08119ebc2b21
    SessionClient will get the below message:
    "Not Found (HTTP 404)" -->
    "Node a938513a-216a-49dc-b801-08119ebc2b21 could not be
    found. (HTTP 404)"

    Change-Id: If57fd938cdb29d0349b923ca5dc1a804f1accd9d
    Closes-Bug: #1402893