dtm/dtmcli
hitzhangjie cc66ceb484 refactor-*: improve code readability
- use clearer method names, comments;
- define dtm usage info;
- determine action by switch-case instead of if-else, because only
  os.Args[1] needs to be checked;
- use time layout '2006-01-02 15:04:05.999' to format milliseconds;
- change filenames dtmsvr/main.go to dtmsvr/dtmsvr.go;
- simplify code;
- use `()` to think less about operator precedence;

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