Rotate the available log files. Note that there are two ways to
deal with the rotation of log files:
Use the OS log rotation facility. In that case the OS must
(1) move the logfile and (2) have something calling
http_log_close/1 to close the (moved) file and make this
server create a new one on the next log message. If
library(http/http_unix_daemon) is used, closing is
achieved by sending SIGHUP or SIGUSR1 to the process.