Description of problem: Deploying RHOS 15 with mentioned topology and running the following tempest tests, gives failures:
tempest.api.compute.servers.test_device_tagging.TaggedBootDevicesTest.test_tagged_boot_devices
tempest.api.compute.servers.test_device_tagging.TaggedBootDevicesTest_v242.test_tagged_boot_devices

Version-Release number of selected component (if applicable):
core_puddle: RHOS_TRUNK-15.0-RHEL-8-20190607.n.1

How reproducible: always


Steps to Reproduce:
1. Deploy RHOS 15 with mentioned topology
2. Run the following tempest tests:
tempest.api.compute.servers.test_device_tagging.TaggedBootDevicesTest.test_tagged_boot_devices
tempest.api.compute.servers.test_device_tagging.TaggedBootDevicesTest_v242.test_tagged_boot_devices

Actual results:
Body: b''
2019-06-11 04:58:10,779 253868 INFO     [tempest.lib.common.rest_client] Request (TaggedBootDevicesTest:_run_cleanups): 204 DELETE http://10.0.0.129:9696/v2.0/networks/593bd47b-69ac-41ad-b39e-1ca6cf95a79e 1.439s
2019-06-11 04:58:10,779 253868 DEBUG    [tempest.lib.common.rest_client] Request - Headers: {'Content-Type': 'application/json', 'Accept': 'application/json', 'X-Auth-Token': '<omitted>'}
        Body: None
    Response - Headers: {'content-length': '0', 'x-openstack-request-id': 'req-f295c71b-9f6c-4688-ba00-3762dc58f706', 'date': 'Tue, 11 Jun 2019 04:58:10 GMT', 'connection': 'close', 'status': '204', 'content-location': 'http://10.0.0.129:9696/v2.0/networks/593bd47b-69ac-41ad-b39e-1ca6cf95a79e'}
        Body: b''
2019-06-11 04:58:12,232 253868 INFO     [tempest.lib.common.rest_client] Request (TaggedBootDevicesTest:_run_cleanups): 204 DELETE http://10.0.0.129:9696/v2.0/networks/f8aff0b1-531d-4803-94f8-59fa1d6824e5 1.452s
2019-06-11 04:58:12,233 253868 DEBUG    [tempest.lib.common.rest_client] Request - Headers: {'Content-Type': 'application/json', 'Accept': 'application/json', 'X-Auth-Token': '<omitted>'}
        Body: None
    Response - Headers: {'content-length': '0', 'x-openstack-request-id': 'req-97f9f6de-1848-4c8f-a8ff-be7c1f38ad2c', 'date': 'Tue, 11 Jun 2019 04:58:12 GMT', 'connection': 'close', 'status': '204', 'content-location': 'http://10.0.0.129:9696/v2.0/networks/f8aff0b1-531d-4803-94f8-59fa1d6824e5'}
        Body: b''
}}}

Traceback (most recent call last):
  File "/usr/lib/python3.6/site-packages/tempest/common/utils/__init__.py", line 89, in wrapper
    return f(*func_args, **func_kwargs)
  File "/usr/lib/python3.6/site-packages/tempest/api/compute/servers/test_device_tagging.py", line 253, in test_tagged_boot_devices
    'boot_index': 2
  File "/usr/lib/python3.6/site-packages/tempest/api/compute/base.py", line 246, in create_test_server
    **kwargs)
  File "/usr/lib/python3.6/site-packages/tempest/common/compute.py", line 265, in create_test_server
    server['id'])
  File "/usr/lib/python3.6/site-packages/oslo_utils/excutils.py", line 220, in __exit__
    self.force_reraise()
  File "/usr/lib/python3.6/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
    six.reraise(self.type_, self.value, self.tb)
  File "/usr/lib/python3.6/site-packages/six.py", line 675, in reraise
    raise value
  File "/usr/lib/python3.6/site-packages/tempest/common/compute.py", line 236, in create_test_server
    clients.servers_client, server['id'], wait_until)
  File "/usr/lib/python3.6/site-packages/tempest/common/waiters.py", line 78, in wait_for_server_status
    raise exceptions.BuildErrorException(server_id=server_id)
tempest.exceptions.BuildErrorException: Server 6f7c86a5-a67f-48a3-b1ed-a604cf3d4933 failed to build and is in ERROR status

Expected results:
Tests passed


Additional info: