ENYO-1712: ServiceRegistry: Add generic `<Service>#authorize()`
ENYO-1712: ServiceRegistry: Add generic `<Service>#authorize()`

- Services implementing security (eg. Phonegap, Dropbox… etc) need to
  override the `Service#authorize()` method.
- add a completion callback to `ServiceRegistry#setConfig()` to allow
  including it in an `async#serie()` or `async#waterfall()`
- reduce service resolver verbosity

Enyo-DCO-1.1-Signed-off-by: Francois-Xavier KOWALSKI <francois-xavier.kowalski@hp.com>

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