Remove binlog statement format config setting

Signed-off-by: Shane Hender <henders@gmail.com>

config/mycnf/default-fast.cnf

@@ -1,7 +1,6 @@
 # basic config parameters for all db instances in the grid
 
 sql_mode = STRICT_TRANS_TABLES
-binlog_format = statement
 character_set_server = utf8
 collation_server = utf8_general_ci
 connect_timeout = 30