Filter migrations by user_id/project_id

In microversion 2.80, the ``GET /os-migrations`` API will have
optional ``user_id`` and ``project_id`` query parameters for
filtering migrations by user and/or project:

* GET /os-migrations?user_id=ef9d34b4-45d0-4530-871b-3fb535988394
* GET /os-migrations?project_id=011ee9f4-8f16-4c38-8633-a254d420fd54
* GET /os-migrations?user_id=ef9d34b4-45d0-4530-871b-3fb535988394&project_id=011ee9f4-8f16-4c38-8633-a254d420fd54

And expose the ``user_id`` and ``project_id`` fields in the following APIs:

* GET /os-migrations
* GET /servers/{server_id}/migrations
* GET /servers/{server_id}/migrations/{migration_id}

Co-Authored-By: Qiu Fossen <qiujunting>
Part of blueprint add-user-id-field-to-the-migrations-table
Change-Id: I7313d6cde1a5e1dc7dd6f3c0dff9f30bbf4bee2c

api-ref/source/server-migrations.inc

@@ -53,10 +53,12 @@ Response
   - status: migrate_status
   - updated_at: updated
   - uuid: migration_uuid
+  - user_id: user_id_migration_2_80
+  - project_id: project_id_migration_2_80
 
-**Example List Migrations (2.59)**
+**Example List Migrations (2.80)**
 
-.. literalinclude:: ../../doc/api_samples/server-migrations/v2.59/migrations-index.json
+.. literalinclude:: ../../doc/api_samples/server-migrations/v2.80/migrations-index.json
    :language: javascript
 
 Show Migration Details
@@ -107,10 +109,12 @@ Response
   - status: migrate_status
   - updated_at: updated
   - uuid: migration_uuid
+  - user_id: user_id_migration_2_80
+  - project_id: project_id_migration_2_80
 
-**Example Show Migration Details (2.59)**
+**Example Show Migration Details (2.80)**
 
-.. literalinclude:: ../../doc/api_samples/server-migrations/v2.59/migrations-get.json
+.. literalinclude:: ../../doc/api_samples/server-migrations/v2.80/migrations-get.json
    :language: javascript
 
 Force Migration Complete Action (force_complete Action)