Request: add support for fake-hardware

[Bas de Bruijne]

Tempest Ironic Plugin tests return:

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ironic_tempest_plugin.tests.api.admin.test_nodes.TestNodes.test_create_node
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Traceback (most recent call last):
  File "/snap/fcbtest/x1/lib/python3.6/site-packages/ironic_tempest_plugin/tests/api/admin/test_nodes.py", line 34, in setUp
    _, self.node = self.create_node(self.chassis['uuid'])
  File "/snap/fcbtest/x1/lib/python3.6/site-packages/ironic_tempest_plugin/tests/api/admin/base.py", line 47, in wrapper
    resp, body = f(cls, *args, **kwargs)
  File "/snap/fcbtest/x1/lib/python3.6/site-packages/ironic_tempest_plugin/tests/api/admin/base.py", line 209, in create_node
    **kwargs)
  File "/snap/fcbtest/x1/lib/python3.6/site-packages/ironic_tempest_plugin/services/baremetal/base.py", line 48, in wrapper
    return f(*args, **kwargs)
  File "/snap/fcbtest/x1/lib/python3.6/site-packages/ironic_tempest_plugin/services/baremetal/v1/json/baremetal_client.py", line 277, in create_node
    return self._create_request('nodes', node)
  File "/snap/fcbtest/x1/lib/python3.6/site-packages/ironic_tempest_plugin/services/baremetal/base.py", line 198, in _create_request
    resp, body = self.post(uri, body=body)
  File "/home/ubuntu/snap/fcbtest/x1/.rally/verification/verifier-f1ae31bf-7cae-421f-b5bc-b4d88103e28a/repo/tempest/lib/common/rest_client.py", line 299, in post
    return self.request('POST', url, extra_headers, headers, body, chunked)
  File "/snap/fcbtest/x1/lib/python3.6/site-packages/ironic_tempest_plugin/services/baremetal/base.py", line 69, in request
    resp, resp_body = super(BaremetalClient, self).request(*args, **kwargs)
  File "/home/ubuntu/snap/fcbtest/x1/.rally/verification/verifier-f1ae31bf-7cae-421f-b5bc-b4d88103e28a/repo/tempest/lib/common/rest_client.py", line 703, in request
    self._error_checker(resp, resp_body)
  File "/home/ubuntu/snap/fcbtest/x1/.rally/verification/verifier-f1ae31bf-7cae-421f-b5bc-b4d88103e28a/repo/tempest/lib/common/rest_client.py", line 814, in _error_checker
    raise exceptions.BadRequest(resp_body, resp=resp)
tempest.lib.exceptions.BadRequest: Bad request
Details: {'error_message': '{"faultcode": "Client", "faultstring": "No valid host was found. Reason: No conductor service registered which supports driver fake-hardware for conductor group \\"\\".", "debuginfo": null}'}
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To my knowledge, this is because the fake-hardware driver is not implemented in the Ironic charms. For functional testing, it would be great if this is implemented.