TO Client: no ids required in input json

[dangogh]

What does this PR do?

Removes requirement for providing IDs for foreign keys when using traffic ops client. Example: using client.CreateProfile, the Cdn field currently must be provided as cdnID. With this change, it can be provided instead as cdnName.

Which TC components are affected by this PR?

• Documentation
• Grove
• Traffic Analytics
• Traffic Monitor
• Traffic Ops
• Traffic Ops ORT
• Traffic Portal
• Traffic Router
• Traffic Stats
• Traffic Vault
• Other _________

What is the best way to verify this PR?

The API tests have also been modified to take advantage of this capability. From traffic_ops/testing/api/v14, run go test -cfg ../conf/traffic_ops_test.conf to test.

Check all that apply

• This PR includes tests
• This PR includes documentation updates
• This PR includes an update to CHANGELOG.md
• This PR includes all required license headers
• This PR includes a database migration (ensure that migration sequence is correct)
• This PR fixes a serious security flaw. Read more: www.apache.org/security

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[dangogh]

retest this please

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