“SNL” is reaching for the “Skars.” It was a family affair for Alexander Skarsgård‘s “Saturday Night Live” hosting debut on Jan. 31. The 6-foot-4 “Pillion” actor was joined by his Oscar-nominated father, Stellan Skarsgård. Other surprise cameos included musical guest Cardi B, who flexed her comedy muscles, and “SNL” alum Pete Davidson as White House...