The response parameter table for the GET /os-migrations
API reference was missing the top level "migrations"
parameter which is the list of migration objects.
While in here, fix the fake "Done" status to "done"
in the sample. There is nothing in nova that uses a
status of "Done". The evacuate operation uses "done".
Change-Id: I1e193237e9aec05395cd2760d96e70db7791409b
183ba80ec5