Remove duplicate input in AirflowNetwork:Distribution:Node

[lgu1234]

Pull request overview

Check duplicated inputs of Component Name or Node Name in AirflowNetwork:Distribution:Node and issue an error
Provide a test file
Correct inputs in 7 example files
No differences were found in 7 example files on local computer

NOTE: ENHANCEMENTS MUST FOLLOW A SUBMISSION PROCESS INCLUDING A FEATURE PROPOSAL AND DESIGN DOCUMENT PRIOR TO SUBMITTING CODE

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[jasondegraw]

@lgu1234 Is this PR ready for review?

[lgu1234]

@jasondegraw Yes. It is ready for review. Thanks.

[jasondegraw]

This corrects the issue, looks good to go.

[lgu1234]

@jasondegraw A failure of unit test was fixed.

[mitchute]

Unit tests pass on this locally. @lgu1234 anything else you're wanting to do here before final review and merge?

[lgu1234]

@mitchute No. Please merge.