Add new API for calculate template hash

[hjhhh3000vitae]

Latest improvements:

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[openapi-sdkautomation]

In Testing, Please Ignore

[Logs] (Generated from 6c513c0, Iteration 9)

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[AutorestCI]

Automation for azure-sdk-for-go

The initial PR has been merged into your service PR:
Azure/azure-sdk-for-go#5639

[AutorestCI]

Automation for azure-sdk-for-python

A PR has been created for you based on this PR content.

Once this PR will be merged, content will be added to your service PR:
Azure/azure-sdk-for-python#6834

[azuresdkci]

Can one of the admins verify this patch?

[raych1]

LGTM.

[hjhhh3000vitae]

@raych1 Since ARM has signed-off, could you please review this PR?

[anthony-c-martin]

@hjhhh3000vitae heads-up - I just merged a new API version (2019-08-01) - you probably want to fetch the latest and also make your changes to this version. I'll block this PR just so it doesn't get accidentally merged.

[anthony-c-martin]

Just blocking this PR as @hjhhh3000vitae will most likely want to pick up the latest changes from master to avoid having to make a separate PR.