rotatelogs: Log the current file size and error code/description

when failing to write to the log file. 

Sometimes users have a hard time believing that their little log
file was really big enough to reach quota/filesystem/other limit
back at the time of the error.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@646845 13f79535-47bb-0310-9956-ffa450edef68