change vfs api for folders (#4741)
change vfs api for folders (#4741)

Co-authored-by: Krrish Mittal <a4cde3950498c63f08e7638c632bce38ea79ed38@microsoft.com>
projectkudu/AzureFunctions,projectkudu/AzureFunctions,projectkudu/AzureFunctions,projectkudu/AzureFunctions