Do not crash if <driver>.sys is open in other process when deleting
Do not crash if <driver>.sys is open in other process when deleting

In Win 10 'xencrsh.sys' and 'xenvbd.sys' cannot be deleted when
cleaning the system because they are still open by another process.
Log this and continue.

Signed-off-by: Kostas Ladopoulos <7920ee5edb7fd3a4c6c6e3ebe9bd13d4a7f2eff1@citrix.com>

kostaslamda/win-installer,OwenSmith/win-installer,benchalmers/win-installer,kostaslamda/win-installer,OwenSmith/win-installer,xenserver/win-installer,OwenSmith/win-installer,benchalmers/win-installer,benchalmers/win-installer,kostaslamda/win-installer,xenserver/win-installer,xenserver/win-installer,xenserver/win-installer,xenserver/win-installer,kostaslamda/win-installer,OwenSmith/win-installer,OwenSmith/win-installer,kostaslamda/win-installer,benchalmers/win-installer,benchalmers/win-installer