Due to typo in dxsdk.ps1 provisioning script, it did not download from
cached location. Also checksum Check was missing.
Task-number: QTQAINFRA-2614
Change-Id: I321549721b256b85513fa1e4ff57ab1302e28f43
Reviewed-by: Heikki Halmet <heikki.halmet@qt.io>