[Component] Fix the image version specification in create cluster component.

[numerology]

Should fix #2211

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This change is 

[Ark-kun]

/lgtm

[Ark-kun]

@hongye-sun Is there some test suite that we could use to test executing the code of GCP components?

[Ark-kun]

tests/google/dataproc/test__create_cluster.py:94: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
.tox/py35/lib/python3.5/site-packages/mock/mock.py:944: in assert_called_with
    six.raise_from(AssertionError(_error_message(cause)), cause)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
value = None, from_value = None
>   ???
E   AssertionError: expected call not found.
E   Expected: create_cluster('mock_project', 'mock-region', {'clusterName': 'test-cluster', 'config': {'initializationActions': [{'executableFile': 'gs://action/1'}, {'executableFile': 'gs://action/2'}], 'configBucket': 'gs://config/bucket'}, 'softwareConfig': {'imageVersion': '1.10'}, 'projectId': 'mock_project', 'labels': {'label-1': 'value-1'}}, request_id='ctx1')
E   Actual: create_cluster('mock_project', 'mock-region', {'clusterName': 'test-cluster', 'config': {'softwareConfig': {'imageVersion': '1.10'}, 'initializationActions': [{'executableFile': 'gs://action/1'}, {'executableFile': 'gs://action/2'}], 'configBucket': 'gs://config/bucket'}, 'projectId': 'mock_project', 'labels': {'label-1': 'value-1'}}, request_id='ctx1')

[Ark-kun]

/lgtm

[Ark-kun]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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[numerology]

/retest

[numerology]

/test kubeflow-pipeline-sample-test