Hard rockers Ratt have just released “Infestation,” their first new CD in 11 years.  The band, whose hits include “Round and Round,” “Lay it Down,” “You’re in Love,” and “Way Cool Jr,” recently put the original lineup back together and have hit the road.  With singer Stephen Pearcy back in the fold after a hiatus, the band sounds re-energized and the new CD is proof.  Infestation is full of crunching guitars and memorable hooks straight out of 1984.  Icon Fetch talks with drummer and founding member Bobby Blotzer about the reunion, new album, and his new book, “Tales of a RATT: Things You Shouldn’t Know.”