Peter White Television EditorUPDATED, 12:06 PM: Foo Fighters, the rock band fronted by Nirvana drummer Dave Grohl, have been added as the musical guest on this weekend’s SNL. It marks the ninth time that the band, which is celebrating the 25th anniversary of its debut album, will have played on the show.PREVIOUSLY, OCT. 31: Dave Chappelle is to host next week’s Saturday Night Live.The comedian will front the NBC show’s sixth consecutive show of the season on November 7.It marks Chappelle’s first