Refactor: change the way to select renderer

Refactor: change the way to select renderer

- introduce service-type from common module (and already used by pce) to
  choose adequate renderer (optical vs otn)
- update transportpce-device-renderer model by 1) replacing service-type
  (which is confusing) in otn-renderer api by service-format which is
  more appropriate 2) changing service-rate type to be aligned with
  service-create rpc input
- adapt the code consequently

JIRA: TRNSPRTPCE-489
Signed-off-by: Gilles Thouenon <gilles.thouenon@orange.com>
Change-Id: Ia506a1af3a9b98516a0c73ed1f4f6671eab04ab6