ANF-437 update for new API 2019-08-01

[leonardbf]

Addition of new volume properties
Change to tag representation
Based on swagger update Azure/azure-rest-api-specs#7660

Description

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This checklist is used to make sure that common guidelines for a pull request are followed.

• Please add REST spec PR link to the SDK PR
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• The pull request does not introduce breaking changes.

General Guidelines

• Title of the pull request is clear and informative.
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Testing Guidelines

• Pull request includes test coverage for the included changes.

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