rsyslog imfile wildcard support

Issue

• Imfile wildcards is supported since rsyslog-7.4.7-16.el7. Reference: RFE 1303617

• However, it doesn't work as expected.

• Configure as following:

# cat /etc/rsyslog.d/test.conf
module(load="imfile")
input(type="imfile" tag="TESTLOG" File="/tmp/testfile*")

• Got following error in /var/log/messages during rsyslog start.

rsyslogd: imfile: The to-be-monitored file "/tmp/testfile*" contains wildcards. This is not supported in polling mode. [v8.24.0 try http://www.rsyslog.com/e/2420 ]