Flaky: Delete temp folder sometimes fails

[mikeharder]

============ Building WebSockets ============
Downloading KoreBuild from https://github.com/aspnet/KoreBuild/archive/dev.zip
Remove-Item : Cannot remove item C:\BuildAgent\temp\buildTmp\KoreBuild-9b4154ad-b537-4893-b27e-213b82afb6da: The 
directory is not empty.
At C:\BuildAgent\work\2b0c8ce712895332\.r\WebSockets\build.ps1:63 char:9
+         Remove-Item -Recurse -Force $tempFolder
+         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : WriteError: (C:\BuildAgent\t...7e-213b82afb6da:DirectoryInfo) [Remove-Item], IOException
    + FullyQualifiedErrorId : RemoveFileSystemItemIOError,Microsoft.PowerShell.Commands.RemoveItemCommand

http://aspnetci/viewLog.html?buildId=206290&tab=buildResultsDiv&buildTypeId=XPlat_Windows_Win10Universe

[Eilon]

Haven't seen this much recently, so closing.