SERIES PREMIERE: With tonight’s inaugural Late Night with Seth Meyers, executive producer Lorne Michaels now controls two hours of TV every weeknight – and both shows, The Tonight Show and Late Night, now are showcasing comics who once anchored “Weekend Update” on Michaels’ Saturday Night Live. It’s good to be the king. Tonight’s opening-night guest: one of Meyers’ “Update” co-anchors, Amy Poehler, and a real newsmaker: Vice President Joe Biden.