Support rolling log files base on file size and time

[yangzhg]

Hi, it seems that glog currently only supports scrolling log files by file size, not by time at the same time, in many scenarios there is a need to support slicing log files by time.

Also, glog can only clean up history log files by time, not by number of history log files.

So I would like to submit a pr that supports splitting log files by time and cleaning history files by number of files.