Replace servicebinding.io duck types with direct secret reference

[georgethebeatle]

Background

Now that the servicebinding controller holds two secrets - one for each binding format (vcap_services and servicebinding.io) it is weird to set only one of these secrets as the .status.binding duck type. According to the servicebinding.io spec it is possible to project a secret directly to a workload instead of depending on a duck type.

Action to take

Project servicebinding.io bindings directly from the servicebinding.io binding secret

[georgethebeatle]

This change is not really worth it as the direct secret projection still needs a binding status field. Whether it is a duck type or not is not too important.