cassanra: fix --cassandra_shard
cassanra: fix --cassandra_shard

iksaif/biggraphite,Thib17/biggraphite,iksaif/biggraphite,criteo/biggraphite,iksaif/biggraphite,dpanth3r/biggraphite,Thib17/biggraphite,criteo/biggraphite,iksaif/biggraphite,criteo/biggraphite,Thib17/biggraphite,criteo/biggraphite,Thib17/biggraphite