[Cognitive Services] Stop override LUIS client class names, revert a case change in CustomVision.

[yangyuan]

1. Client class names, addition to [Cognitive Services] unify client class names, folder cases. #3365
2. Revert a case change in CustomVision, (XUnit HttpMockServer is case sensitive)

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[AutorestCI]

Automation for azure-sdk-for-python

This PR contains more than 3 context, SDK generation is not enabled. Contexts found:

• cognitiveservices/data-plane/LUIS/Runtime
• cognitiveservices/data-plane/CustomVision/Prediction
• cognitiveservices/data-plane/CustomVision/Training
• cognitiveservices/data-plane/LUIS/Authoring

[AutorestCI]

Automation for azure-sdk-for-node

This PR contains more than 3 context, SDK generation is not enabled. Contexts found:

• cognitiveservices/data-plane/LUIS/Authoring
• cognitiveservices/data-plane/CustomVision/Training
• cognitiveservices/data-plane/CustomVision/Prediction
• cognitiveservices/data-plane/LUIS/Runtime

[AutorestCI]

Automation for azure-sdk-for-java

This PR contains more than 3 context, SDK generation is not enabled. Contexts found:

• cognitiveservices/data-plane/LUIS/Authoring
• cognitiveservices/data-plane/CustomVision/Training
• cognitiveservices/data-plane/LUIS/Runtime
• cognitiveservices/data-plane/CustomVision/Prediction

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This PR contains more than 3 context, SDK generation is not enabled. Contexts found:

• cognitiveservices/data-plane/LUIS/Runtime
• cognitiveservices/data-plane/CustomVision/Training
• cognitiveservices/data-plane/CustomVision/Prediction
• cognitiveservices/data-plane/LUIS/Authoring

[AutorestCI]

Automation for azure-sdk-for-go

This PR contains more than 3 context, SDK generation is not enabled. Contexts found:

• cognitiveservices/data-plane/CustomVision/Prediction
• cognitiveservices/data-plane/LUIS/Runtime
• cognitiveservices/data-plane/LUIS/Authoring
• cognitiveservices/data-plane/CustomVision/Training

[marstr]

I'm surprised that we have case-sensitive paths in Azure. This seems like a real smell to me. However, I'm not going to stand in the way when I'm being told that this is in the way of people being able to use the service.

[yangyuan]

@marstr
About the case sensitive stuff, actually both works.
But the testing framework is case-sensitive in URL. Will work with corresponding team to solve the issue.