Use a zero-padded decimal number for logfile names to improve

alphabetic sorts on the directory.

Submitted by: Mitchell Blank Jr
Reviewed by: Ben Laurie, Jim Jagielski, Roy Fielding


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@77908 13f79535-47bb-0310-9956-ffa450edef68