Compute 'force_service_down' API returns 400 with current version 2.72

[Shilpa Devharakar]

Bug Description:
-----------------
Openstacksdk returns 200 response for compute 'force_service_down' API with version 2.52
But with version 2.53 onwards, it returns 400

Observed that compute version 2.53 onwards 'force_service_down' API is superseded at
https://github.com/openstack/nova/commit/2f7bf29d472d349759ffd8aece23a75f4e27a4f9#diff-f04ac2da81ec6e182a88634657e150c7R204

And relevant changes which are needed at openstacksdk are not there.

Error log:
----------
DEBUG nova.api.openstack.wsgi [None req-98ed7264-002c-488b-94b4-47b00bf9b4f3 admin admin] Action: 'update', calling method: <function version_select at 0x7fc1603baed8>, body: {"binary": "nova-compute", "host": "<HOST_NAME>", "forced_down": true} {{(pid=1062) _process_stack /opt/stack/nova/nova/api/openstack/wsgi.py:520}}
DEBUG nova.api.openstack.wsgi [None req-98ed7264-002c-488b-94b4-47b00bf9b4f3 admin admin] Returning 400 to user: Additional properties are not allowed (u'binary', u'host' were unexpected) {{(pid=1062) __call__ /opt/stack/nova/nova/api/openstack/wsgi.py:943}}
INFO nova.api.openstack.requestlog [None req-98ed7264-002c-488b-94b4-47b00bf9b4f3 admin admin] 10.232.48.201 "PUT /compute/v2.1/os-services/force-down" status: 400 len: 118 microversion: 2.72 time: 0.004179
[pid: 1062|app: 0|req: 260/517] 10.232.48.201 () {68 vars in 1415 bytes} [Mon Mar 25 12:16:58 2019] PUT /compute/v2.1/os-services/force-down => generated 118 bytes in 5 msecs (HTTP/1.1 400) 9 headers in 383 bytes (1 switches on core 0)

Expected:
---------
Openstacksdk should return 200 response for compute 'force_service_down' API with current version i.e.2.72

[Matt Riedemann (mriedem)]

This is tracked in storyboard: https://storyboard.openstack.org/#!/story/2005349