As service author, I can describe in a manifest services that get created and bound to a backing app

[royclarkson]

GIVEN The application manifest contains:

spring:
  cloud
    appbroker:
      services: 
        apps:
        - name: app-with-services
          services:
          - service-instance-name: my-db-service
            name: mysqldb
            plan: small
            parameters: 
              key: value
          - service-instance-name: my-messaging-service
            name: rabbitmq
            plan: medium
            parameters: 
              key: value

WHEN a service instance is created
THEN backing service instances with the given names and plans should be created (asynchronously if required by the service) and bound to the app-with-services app