Semyon Varlamov, pictured here at training camp, provided a sparklingperformance in a 2-0 shutout of Buffalo last night. Photo by photopete. Semyon Varlamov earned his first shutout of the season Wednesday night, and it couldn’t have come at a better time. The Caps — who had dropped three straight games and four of their last five — were nursing a one-goal lead in the third against Buffalo Wednesday night, when Alex Ovechkin was called…