logrotate: should allow reading log file list from file/command

[cgzones]

Based on https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=50044, https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=326421 and https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=353663:

Multiple people suggested a feature applying a configuration to an (at configuration time) unknown list of files. Either this set can be read from a file or retrieved from a command:

</tmp/apache-logfiles {  # read from file
    monthly
    ...
}

`/usr/sbin/syslogd-listfiles --weekly` {  # read from command output
    weekly
    ...
}

@include /var/cache/syslog/filelist {  # read from file
    daily
    ...
}

[kdudka]

You can either use the include configuration directive for this, or just generate logrotate's configuration from a template prior to running logrotate.