Fixing autorest validator args

[dsgouda]

Replacing azure-arm=true with azure-validator=true to work with the new validator.

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[AutorestCI]

No modification for Ruby

[AutorestCI]

No modification for NodeJS

[AutorestCI]

No modification for Python

[vishrutshah]

@dsgouda Could you please also update this change https://github.com/Azure/azure-rest-api-specs/blob/master/scripts/getStatus.js#L90 :)