[$75]Validate for Valid Users

[veshu]

Currently, JobCandidate POST fails If a user issue exists on v5/users with below message

{
    "message": "userId: 887xxxxx \"user\" not found"
}

This means the userId (who is posting the job) is created and part of v3 API but not available on v5/user.
Hence follow the below steps for creating v5/users and then create a job candidate. Verify for PUT/PATCH too.

Steps need to do

1. Create user on Ubahn
2. Map the user with org

See https://github.com/topcoder-platform/u-bahn-bulk-processor/blob/develop/src/services/ProcessorService.js#L86-L92

[veshu]

Contest https://www.topcoder.com/challenges/30154009 has been created for this ticket.

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[veshu]

Contest https://www.topcoder.com/challenges/30154009 has been updated - it has been assigned to aaron2017.

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[imcaizheng]

Fixed. See #19

[veshu]

Payment task has been updated: https://software.topcoder.com/review/actions/ViewProjectDetails?pid=30154009

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