* make glog flush and RAY_LOG thread-safe
* dump error log to console
* mapping all levels to destination
* hack glog for exporting message to stdout if no base name given
* patch lint
* use stdout logger by default
* add raylet std/err pytest checker
* add worker logs file check
* fix asan check
* loop in glog enums
* fix python lint
* lint for autoindent
* fix indent lint
* make raylet.err is not empty
