v1.9.0

All changes

• Refactor the Azure plugin (#206, @ywk253100)
• Adjust the buffer size to avoid OOM (#210, @ywk253100)
• Add MSI Support for Azure plugin (#212, @yanggangtony)
• Bump version of Azure Compute SDK to support Prem SSD V2 (#215, @ywk253100)
• Fix docs around storageaccounturi (#218, @anshulahuja98)