400 error on getting certificates from Barbican

[hongbin]

Steps to reproduce:

1. Enable Barbican on devstack.
2. Ensure cert_manager_type is barbican in Magnum config file (/etc/magnum/magnum.conf)
3. Create a secure k8s bay:
4. Create a pod

Then, you should see the pod creation failed:

$ magnum pod-create --manifest ./redis-master.yaml --bay k8sbay
ERROR: Remote error: HTTPClientError Bad Request
[u' (HTTP 500)

Here is the log in magnum conductor:

http://paste.openstack.org/show/476502/

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/236094

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/236094
Committed: https://git.openstack.org/cgit/openstack/magnum/commit/?id=18b61bce5124120e1534a95c2afb3bc572cdc215
Submitter: Jenkins
Branch: master

commit 18b61bce5124120e1534a95c2afb3bc572cdc215
Author: Hongbin Lu <email address hidden>
Date: Fri Oct 16 16:49:08 2015 -0400

    Fix incorrect usage of CertManager in k8s_api

    This should fix a 400 error on getting certificates from Barbican.

    Change-Id: I5cd934ba0df41fe34e74ae7c90febeccc821f758
    Closes-Bug: #1506906