block_device: introduce helper function to check swap or ephemeral device
and move generic function, mappings_prepend_dev() from ec2utils to block_device
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@@ -187,7 +187,7 @@ class Ec2utilsTestCase(test.TestCase):
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'device': '/dev/sdc1'},
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{'virtual': 'ephemeral1',
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'device': '/dev/sdc1'}]
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self.assertDictListMatch(ec2utils.mappings_prepend_dev(mappings),
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self.assertDictListMatch(block_device.mappings_prepend_dev(mappings),
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expected_result)
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