Update release_versions format to match property-overrides
Update release_versions format to match property-overrides

- Format:

```
release_versions:
- name: cf-mysql
  version: 25
```

Signed-off-by: Ben Calegari <bcalegari@pivotal.io>

[#110775864]

cloudfoundry/cf-mysql-release,cloudfoundry/cf-mysql-release,cloudfoundry/cf-mysql-release,cloudfoundry/cf-mysql-release