March 8 (Reuters) - Gary Lineker was never booked in his 16-year playing career but the former England striker is in danger of being shown the red card by his employer, the BBC, for standing up for refugees trying to make their way to Britain. Lineker has hosted the BBC's flagship football show "Match of the Day" for more than 20 years and the charismatic 62-year-old has never been afraid to voice his opinions about political issues like Brexit. As the BBC's highest-paid employee, Lineker is the face of its sports coverage. Although the corporation has strict impartiality guidelines, that...