fix the connection of cassandra

fix the connection of cassandra ,let filer can connect to multi cassandra nodes which are in the one cluster

weed/filer/cassandra_store/cassandra_store.go

@@ -2,7 +2,7 @@ package cassandra_store
 
 import (
 	"fmt"
-
+	"strings"
 	"github.com/chrislusf/seaweedfs/weed/filer"
 	"github.com/chrislusf/seaweedfs/weed/glog"
 
@@ -34,11 +34,8 @@ func NewCassandraStore(keyspace string, hosts ...string) (c *CassandraStore, err
 	c = &CassandraStore{}
 	        s := strings.Split(hosts, ",")
         if len(s) == 1 {
-		fmt.Println("000")
                 c.cluster = gocql.NewCluster(hosts...)
         } else if len(s) > 1 {
-		fmt.Println("111",s[0])
-		fmt.Println("222",s[1])
                 c.cluster = gocql.NewCluster(s[0], s[1])
         }
 	c.cluster.Keyspace = keyspace