rally-openstack heat scaling scenarios fails

[Peter Razumovsky]

When I try to run HeatStacks.create_stack_and_scale scenario, it fails with error:

```
2430-4f10-aa84-a016c187f469 | ITER: 2 END:
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/rally/task/runner.py", line 71, in _run_scenario_once
    getattr(scenario_inst, method_name)(**scenario_kwargs)
  File "/usr/local/lib/python2.7/dist-packages/rally_openstack/scenarios/heat/stacks.py", line 210, in run
    self._scale_stack(stack, output_key, delta)
  File "/usr/local/lib/python2.7/dist-packages/rally_openstack/scenarios/heat/utils.py", line 298, in _scale_stack
    self._stack_webhook(stack, output_key)
  File "/usr/local/lib/python2.7/dist-packages/rally_openstack/scenarios/heat/utils.py", line 328, in _stack_webhook
    requests.post(url).raise_for_status()
  File "/usr/local/lib/python2.7/dist-packages/requests/api.py", line 112, in post
    return request('post', url, data=data, json=json, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/requests/api.py", line 58, in request
    return session.request(method=method, url=url, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/requests/sessions.py", line 512, in request
    resp = self.send(prep, **send_kwargs)
  File "/usr/local/lib/python2.7/dist-packages/requests/sessions.py", line 622, in send
    r = adapter.send(request, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/requests/adapters.py", line 511, in send
    raise SSLError(e, request=request)
SSLError: HTTPSConnectionPool(host='10.12.0.80', port=8000): Max retries exceeded with url: /v1/signal/arn%3Aopenstack%3Aheat%3A%3A52e42cc243f84fa798de2f796bf1e6c3%3Astacks/s_rally_fd21df9d_pD95xL1F/bfc14321-3a44-4a08-8637-282727e17b64/resources/scaling_policy?Timestamp=2018-11-26T05%3A23%3A56Z&SignatureMethod=HmacSHA256&AWSAccessKeyId=885e974a7541428c89ca29eb5f96531d&SignatureVersion=2&Signature=uDDvqpo3y7dcx9yu2C0tI0bQxUBvWz4u64Vkl5agKl0%3D (Caused by SSLError(SSLError("bad handshake: Error([('SSL routines', 'tls_process_server_certificate', 'certificate verify failed')],)",),))
```

This is a bug of rally-openstack scale_webhook method.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/624747

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/624747
Committed: https://git.openstack.org/cgit/openstack/rally-openstack/commit/?id=ac0a3ce67ce5ce723ec665f3ca9f8b660da11087
Submitter: Zuul
Branch: master

commit ac0a3ce67ce5ce723ec665f3ca9f8b660da11087
Author: prazumovsky <email address hidden>
Date: Wed Dec 12 19:57:10 2018 +0400

    Add verify option to scale webhook request

    Add verify option to post request in scale_webhook method
    to fix SSLError certificate verify failed.

    Closes-bug: #1808179
    Change-Id: I1a4a226b9dba9de246f5e94a473f8c4f3e37d379

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/rally-openstack 1.4.0 release.