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: record removed member to check incoming message