rsyslog $FileGroup config directive fails for groups larger than a certain size

Issue

1. Create a large group with tons of users

2. Use rsyslog's $FileGroup config directive to make a log file be created with that group as the owner

3. If the group is larger than a certain size, rsyslogd will fail to resolve the group and thus the file will be created with root as the group owner

4. A message will be printed to the system log, e.g.:

   Nov 12 15:46:56 dhcp153-77 rsyslogd-3003: ID for group 'biggroup' could not be found or error [try http://www.rsyslog.com/e/3003 ]