Add pagination and Changes-since filter support for os-migrations.

This patch adds pagination support and changes-since filter
for os-migrations API.

Users can now use 'limit' and 'marker' to perform paginate
query of running migrations list. Users can also filter the
results according to the migrations' updated time.

The ``GET /os-migrations`` and server migrations APIs will now
return a uuid value in addition to the migrations id in the response,
and the query parameter schema of the ``GET /os-migrations`` API no
longer allows additional properties.

Co-Authored-By: Yikun Jiang <yikunkero@gmail.com>

Implement: blueprint add-pagination-and-change-since-for-migration-list
Change-Id: I7e01f95d7173d9217f76e838b3ea71555151ef56

api-ref/source/server-migrations.inc

@@ -52,10 +52,11 @@ Response
   - source_node: migrate_source_node
   - status: migrate_status
   - updated_at: updated
+  - uuid: migration_uuid
 
-**Example List Migrations**
+**Example List Migrations (2.59)**
 
-.. literalinclude:: ../../doc/api_samples/server-migrations/v2.23/migrations-index.json
+.. literalinclude:: ../../doc/api_samples/server-migrations/v2.59/migrations-index.json
    :language: javascript
 
 Show Migration Details
@@ -105,10 +106,11 @@ Response
   - source_node: migrate_source_node
   - status: migrate_status
   - updated_at: updated
+  - uuid: migration_uuid
 
-**Example Show Migration Details**
+**Example Show Migration Details (2.59)**
 
-.. literalinclude:: ../../doc/api_samples/server-migrations/v2.23/migrations-get.json
+.. literalinclude:: ../../doc/api_samples/server-migrations/v2.59/migrations-get.json
    :language: javascript
 
 Force Migration Complete Action (force_complete Action)