split raft server logic into separate module
move to util
split config
use infof instead of fmt.Printf
use check util
use check utl
move etcdMux to etcd_handlers.go (better proximity code)
fix race
gofmt
move trans related func to trans.go
move tslconf to conf.go
Merge pull request #109 from xiangli-cmu/fmilo

split raft server logic into separate module