api: Introduce microversion 2.89 adjusting os-volume_attachments

This microversion adds attachment_id and bdm_uuid as stored in the
underlying bdm record while also removing the duplicate id field from
the responses of ``GET /servers/{server_id}/os-volume_attachments`` and
``GET /servers/{server_id}/os-volume_attachments/{volume_id}``.

To accomidate this within the _translate_attachment_summary_view helper
is folded into _translate_attachment_detail_view with the remaining
caller in the now deprecated os-volumes API now replaced with a static
dictionary.

Blueprint: add-attachmentid-to-responses-of-the-os-volume-attachments-api
Change-Id: I977c3fd9bbb1e1d42e6979222137e7366d2815e8

doc/api_samples/versions/v21-version-get-resp.json

@@ -19,7 +19,7 @@
             }
         ],
         "status": "CURRENT",
-        "version": "2.88",
+        "version": "2.89",
         "min_version": "2.1",
         "updated": "2013-07-23T11:33:21Z"
     }

doc/api_samples/versions/versions-get-resp.json

@@ -22,7 +22,7 @@
                 }
             ],
             "status": "CURRENT",
-            "version": "2.88",
+            "version": "2.89",
             "min_version": "2.1",
             "updated": "2013-07-23T11:33:21Z"
         }