test: add discovery to tests
test: add govet to tests
Merge pull request #1337 from jonboulle/govet

tests: add `go vet` coverage
raft: add a one node bench
Merge pull request #1102 from coreos/node_bench

raft: add a one node bench
raft: fix node bench
Merge pull request #1341 from coreos/fix_bench

raft: fix node bench
etcdserver/etcdhttp: store location adjustment

Detailed adjustment:
/_etcd/machines/* -> /0/members/*
/* -> /1/*

And it keeps key path returned to user the same as before.
etcdserver: const XXXDir -> StoreXXXPrefix

and code clean