raft: make id int64
Merge pull request #6 from etcd-team/raft_int64

raft: make id int64
etcd: pass v2 kv api tests
config: remove deprecated flags
config: make config a self-contained pkg
etcd: support old flags
config: remove unused map
etcd: use v2 machines prefix
etcd: support v2/machines endpoint
etcd: add a kv tests todo
etcd: support v2 leader endpoint
etcd: fix machines endpoint test
etcd: support v2 peers endpoint
etcd: support v2 store stats endpoint
etcd: separate raft and client port
etcd: support raft tls
etcd: support etcd server tls
etcd: support cors
main: generate 64bit id