Fix bad serializer configuration in Raft implementation.
Fix bad serializer configuration in Raft implementation.

aruanruan/copycat,madjam/copycat,tempbottle/copycat,arnonmoscona/copycat,aruanruan/copycat,arnonmoscona/copycat,tempbottle/copycat,atomix/atomix,kuujo/copycat,kuujo/copycat,madjam/copycat,atomix/atomix