Update slice.proto

  rpc UpdateSlice(context.Slice  ) returns (context.SliceId) {}

  rpc DeleteSlice(context.SliceId) returns (context.Empty  ) {}

  rpc OrderSliceWithSLA(context.Slice) returns (context.SliceId) {} // If slice with SLA already exists, returns slice. If not, it creates it.

  rpc processSliceGrouping (context.Empty) returns (context.Empty) {} // Optimizes the underlying services and re-maps them to the requested slices.

  rpc runSliceGrouping (context.Empty) returns (context.Empty) {} // Optimizes the underlying services and re-maps them to the requested slices.

}