test separate_rabbit_service_shutdown failed on OSTF check step on attempts to delete volume

[Tatyanka]

Shutdown one rabbit node

Scenario:
1. Revert snapshot separate_rabbit_service
2. Destroy rabbit node that is master
3. Wait HA is working
4. Run OSTF

Ostf test failed:
Failed 1 OSTF tests; should fail 0 tests. Names of failed tests:
  - Create volume and boot instance from it (failure) Can not delete volume. Please refer to OpenStack logs for more details.

In ostf log there is 400 bad request on deletion according to volume is in attached state

urllib3.connectionpool: DEBUG: Setting read timeout to None
urllib3.connectionpool: DEBUG: "DELETE http://10.109.6.2:8776/v2/c49533905e064771abf733a37cb10a5c/volumes/2b849fa8-42f9-4a6d-bcb8-4fc56a1776e6 HTTP/1.1" 400 92
fuel_health.common.test_mixins: DEBUG: Traceback (most recent call last):
  File "/usr/lib/python2.6/site-packages/fuel_health/common/test_mixins.py", line 177, in verify
    result = func(*args, **kwargs)
  File "/usr/lib/python2.6/site-packages/cinderclient/v2/volumes.py", line 291, in delete
    self._delete("/volumes/%s" % base.getid(volume))
  File "/usr/lib/python2.6/site-packages/cinderclient/base.py", line 166, in _delete
    resp, body = self.api.client.delete(url)
  File "/usr/lib/python2.6/site-packages/cinderclient/client.py", line 311, in delete
    return self._cs_request(url, 'DELETE', **kwargs)
  File "/usr/lib/python2.6/site-packages/cinderclient/client.py", line 269, in _cs_request
    **kwargs)
  File "/usr/lib/python2.6/site-packages/cinderclient/client.py", line 252, in request
    raise exceptions.from_response(resp, body)
BadRequest: Volume cannot be deleted while in attached state (HTTP 400) (Request-ID: req-27a8de2c-63e3-4e77-8fa8-c67ea9564c89)

[Tatyanka (tatyana-leontovich)]

move to 9.0 according to we do not fix medium issues for 8.0 anymore