Remove unecessary if else and use dictionary instead

[Joeper214]

What this patch does to fix the issue.

Remove unnecessary if-else statement and use python dictionary instead on blueoil init

Link to any relevant issues or pull requests.

n/a

[bo-code-review-bot]

This PR needs Approvals as follows.

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• Readability Approval for Python from tkng, tsawada

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[tfujiwar]

It gets readable than before. Thank you!!
Readability Approval.

[tsawada]

Please put me as a reviewer after ownership approval

[Joeper214]

@iizukak This Needs Ownership Review.

[iizukak]

Ownership Approval

[tsawada]

Readability Approval

[Joeper214]

/ready

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