upgrade autorest.csharp version and remove data-plane flag

[chunyu3]

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We will set 'data-plane' as autorest.csharp codegen default target. and will add new tag 'generation1-convenience-client' tag for the HLC Client Library.

In order to upgrade to the new autorest.csharp which will use 'data-plane' as default target, we need to migrate current SDKs in azure-sdk-for-net step by step as following:

1. Add new flag 'generation1-convenience-client' to all HLC SDKs
2. Merge change in autorest.csharp Make data-plane default tag autorest.csharp#2146
3. Upgrade autorest.csharp version and Remove old flag (data-plane) from the DPG SDKs

This pull request is #3

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