Daniel Farke’s Leeds United ran out 3-0 winners over Michael Skubala’s Lincoln City in a behind-closed-doors friendly on Tuesday, with Farke calling up six youngsters to his side. Pre-season is well underway at Thorp Arch and The Whites are set to jet off to Germany this weekend, after facing Harrogate Town on Friday before returning to face Valencia at Elland Road on August 3. But Tuesday saw Leeds’ senior side, U21 team and U18’s in action. The second string and the 18’s went north of the border to Rangers training base Auchenhowie and secured 1-0 and 3-0 wins in Glasgow. The first team mean…