As an app developer I want the service binding credentials to be available to the app as a servicebinding.io binding

[danail-branekov]

GIVEN I have bound an app to a managed service
WHEN I check the $SERVICE_BINDING_ROOT directory from within the app
THEN I see a subdirectory representing the binding containing files for each entry of the binding credentials

Dev notes:

• In order to get the servicebinding.io ducktype working, the name of the secret where the binding credentials have been stored to should be set to CFServiceBinding.Status.Binding.Name
• The secret above should have type servicebinding.io/managed
• The implementation should create a servicebinding.io ServiceBinding with Spec.Type set to managed
• servicebinding.io docs
• Managed services proposal