Invalid message returned when attempting to use version 3

[Matt Thompson]

My tool is using client version 3, which has recently been removed from python-novaclient. When running my tool, I get an incomplete error back from novaclient:

>>> from novaclient.client import Client as nova_client
>>> auth_token='redacted'
>>> bypass_url='redacted'
>>> nova_client('3', auth_token=auth_token, bypass_url=bypass_url)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python2.7/dist-packages/novaclient/client.py", line 805, in Client
    client_class = get_client_class(version)
  File "/usr/local/lib/python2.7/dist-packages/novaclient/client.py", line 801, in get_client_class
    raise exceptions.UnsupportedVersion(msg)
novaclient.exceptions.UnsupportedVersion: Invalid client version '3'. must be one of:
>>>

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/190141

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/190141
Committed: https://git.openstack.org/cgit/openstack/python-novaclient/commit/?id=84aec86319c6fc456db472e340188a5782e13741
Submitter: Jenkins
Branch: master

commit 84aec86319c6fc456db472e340188a5782e13741
Author: Matt Thompson <email address hidden>
Date: Wed Jun 10 13:05:18 2015 +0100

    Pass full path to pkgutil.iter_modules()

    On my production system, when using client version 3, an exception is
    raised with an incomplete message as the installed novaclient is
    failing to find the bundled client versions. This commit creates a new
    _get_available_client_versions() method and moves the client version
    searching from get_client_class() into it.

    We also update __get_available_client_versions() to pass
    pkgutil.iter_modules the full path to novaclient rather than
    'novaclient', which is what actually resolves the issue here.

    Lastly, we add a single test to ensure that
    __get_available_client_versions() does not return an empty list.

    Change-Id: I07ce414863e833c72e50ad8cf1824054cfb41457
    Closes-Bug: #1463809