store: fix the bug caused by random iteration order over map
Merge pull request #42 from etcd-team/fix-store

store: fix the bug caused by random iteration order over map
etcd: attach default scheme to the peer-list if scheme is not given
Merge pull request #29 from etcd-team/etcd_empty_scheme

etcd: attach default scheme to the peer-list if scheme is not given
server: use random generated node id