Support service bindings without name tag in manifests

[danail-branekov]

No description provided.

[danail-branekov]

Although this is not described in latest CF API v3 manifest schema, the name tag of a service could be omitted. it seems that there are plenty of already existing apps that leverage that format, so maybe we should support it.

Acceptance

GIVEN I have created a service instance my-service
WHEN I push the following manifest

---
version: 1
applications:
- name: my-app
services:
- my-service

THEN I see pushing the manifest succeeding and the app has been bound to the my-service service