[Ansible-service-broker] IMPORTANT: Bind credential extraction

[Erik Nelson]

>    Test the PRs for apb-examples/ansible-service-broker prior to merging
>    Build broker locally, build apb-base, mediawiki/postgres and push to
> private dockerhub
>    Test a provision/bind workflow with mediawiki and postgres
>    If all looks good proceed with merge to master and rebuild.

I will take this on tomorrow.