Remove organization from the image field in the apb.yml.

[cfchase]

Current behavior:
#apb.yml
image: ansibleplaybookbundle/my-apb
This means that the broker downloads the spec from an organization, but may actually download the image from an entirely different organization, leading to confusion.

Proposed:
#apb.yml
image: my-apb
ASB will assume the apb image is in the same repository and org where the spec was found.

Will require changes in:

• ansible-service-broker - no longer use the org in a spec and use where it's hosted instead.
• ansible-playbook-bundle - remove org from apb-init and build

[cfchase]

openshift/ansible-service-broker#288
ansibleplaybookbundle/ansible-playbook-bundle#69