* Configurable API polling duration to support async backing services
By default cf-java-client will set a default completion timeout of 5 Mins.
The api-polling-timeout property now enables a configureable value
applied in create/update/delete service instance CF API calls for
backing services.
* Refine Configurable API polling duration to support async backing services
- now fetches the polling duration in app properties as documented, then defaults to global properties, then defaults to constant
- cleaned up comments
* Fix missing javadoc as reported by checkstyle
bc7d75bbe2