Specified content type is dropped on single step create secret

[John Vrbanac]

Description: On single step creation of a secret, if you include a payload content type without a payload it creates the secret and just throws away the content type data. I would expect that this would throw an error as the content type has to have the payload to work.
Environment: Dev | Local
Test Specification: functional.secrets.SecretsAPI.test_create_secret_with_only_content_type

Steps to reproduce:
1. Create a secret
POST http://{{host}}/v1/{{tenant_id}}/secrets
{
  "payload_content_type": "text/plain"
}
Expected:
400 Bad Request

Actual Response:
201 Created
{
    "secret_ref": "http://localhost:9311/v1/test_tenant/secrets/1576d586-0c25-4f25-b165-36fba6f61872"
}

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/72190

[Arvind Tiwari (arvind-tiwari)]

fix ready for review
https://review.openstack.org/#/c/72190

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/72190
Committed: https://git.openstack.org/cgit/stackforge/barbican/commit/?id=6df41d181921753fcd78aed477b4317bfb963291
Submitter: Jenkins
Branch: master

commit 6df41d181921753fcd78aed477b4317bfb963291
Author: Arvind Tiwari <email address hidden>
Date: Sun Feb 9 16:46:47 2014 -0700

    Specified content type is dropped
    on single step create secret

    Closes-Bug: #1254169

    Change-Id: Ibb8543186157ee67ac6020e729e7323155ed7a1d