wal: init
wal: make new work
wal: add tests for write
raft: add Load
wal: check written data in tests
wal: add Read
wal: cleanup
wal: use buffer
wal: add newWal helper func
raft: refactor recover
wal: add CoreOS copyright
wal: reorgnize wal file
wip: wal glue
etcd: add destoryCluster for testing
etcd: use tmpDir as testing directory
server: save correct nodeId for participant
server: apply ents when loading log
server: move TestSingleNodeRecovery under etcd/
server: improve TestKillLeader and TestKillRandom

Remove testing on 11-node cluster due to lack of fds
server: move TestClusterConfigReload to etcd/