Bump src/cloud_controller_ng:

Alex Jackson, Alex Suraci and Onsi Fakhouri (1):
      add Task object

Alex Suraci and Onsi Fakhouri (1):
      store Task secure token in database (encrypted)

David Julia and Matt Royal (1):
      Small refactor in ServiceBrokersController

Jimmy Da and Matthew Horan (2):
      Raise duplicate instance exception for AppDirect ErrorResponse
      Bump vcap_common