pump should log version info before other logs

[tennix]

2018/04/09 19:35:03 Connected to 10.7.104.184:2181
2018/04/09 19:35:03 Authenticated: id=144229920926728194, timeout=40000
2018/04/09 19:35:03 Re-submitting `0` credentials after reconnect
2018/04/09 19:35:03 config.go:235: [info] get kafka addrs from zookeeper: 10.7.232.216:9092,10.7.104.184:9092,10.7.113.43:9092
2018/04/09 19:35:03 Recv loop terminated: err=EOF
2018/04/09 19:35:03 Send loop terminated: err=<nil>
2018/04/09 19:35:03 version.go:18: [info] Git Commit Hash: 2a7761f992dbf13ed8ccf59ca485e9c5cb5143d6
2018/04/09 19:35:03 version.go:19: [info] Build TS: 2018-04-02 10:27:34
2018/04/09 19:35:03 version.go:20: [info] Go Version: go1.10
2018/04/09 19:35:03 version.go:21: [info] Go OS/Arch: linuxamd64
time="2018-04-09T19:35:03+08:00" level=info msg="[pd] create pd client with endpoints [http://jira-cluster-pd:2379]"
time="2018-04-09T19:35:03+08:00" level=info msg="[pd] leader switches to: http://jira-cluster-pd-f56wf.jira-cluster-pd-peer.jira-tidb.svc:2379, previous: "
time="2018-04-09T19:35:03+08:00" level=info msg="[pd] init cluster id 6537979386539282199"
2018/04/09 19:35:03 server.go:126: [info] clusterID of pump server is 6537979386539282199
2018/04/09 19:35:03 binlogger.go:80: [info] create and lock binlog file data.pump/clusters/6537979386539282199/binlog-0000000000000000-20180409193503
2018/04/09 19:35:06 server.go:451: [info] generate fake binlog successfully

pump logs kafka connection info before version info, if kafka connection failed there'll be no version info from logs which may make debug more difficult.