fix: local data source relative path includes the first directory

[speg03]

Issue #, if available:

Description of changes:

When we pass a local relative path to data source, LocalFileDataSource gets the path with missing first directory. This PR fix it.

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[jesterhazy]

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[speg03]

E botocore.errorfactory.ResourceInUse: An error occurred (ResourceInUse) when calling the CreateTrainingJob operation: Training job names must be unique within an AWS account and region, and a training job with this name already exists (arn:aws:sagemaker:us-west-2:142577830533:training-job/test-tf-horovod-2019-03-16-14-30-07-664)

Do I have to do something to this error? It seems to be happening due to something other than my changes...

[jesterhazy]

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[mvsusp]

@speg03

Thanks for your contribution, I am updating the branch and running the tests again. I don't think the errors are related to your changes.

[jesterhazy]

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[jesterhazy]

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[jesterhazy]

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[jesterhazy]

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[jesterhazy]

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[jesterhazy]

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