Add an Enqueue function to the gRIBI fluent library. (#167)
Add an Enqueue function to the gRIBI fluent library. (#167)

* (M) fluent/fluent.go
    - Add Enqueue to the fluent library which allows a pre-formed
      set of ModifyRequests to be added to the queue of the gRIBI
      client.
openconfig/gribigo,openconfig/gribigo