Bug 1960536

Description of problem:
If I set FSync=on in imjournal module, the rsyslogd opens 3 additional
/var/lib/rsyslog everytime 10 lines of messages are written to log.
This symptom will consume all file descriptors in the end.

Version-Release number of selected component (if applicable):
rsyslog-8.1911.0-6.el8.x86_64

How reproducible:
Always

Steps to Reproduce:
1. Install latest rsyslog.

2.Edit rsyslog.conf

2.1 disable following line. 
#$ModLoad imjournal # provides access to the systemd journal

2.2 add following lines.
module(load="imjournal"
StateFile="imjournal.state"
IgnoreNonValidStatefile="on"
IgnorePreviousMessages="on"
FSync="on"                    <==
Ratelimit.Interval="0"
)

3. Restart rsyslogd

4. Keep watching number of open files.
while true
do  
  lsof |grep /var/lib/rsyslog |wc -l
  sleep 15
done

If the number of open files change slower,
then use logger(1) to send messages to /var/log/messages.
If you send 10 messages,  rsyslogd will add 3 additional
/var/lib/rsyslog open directories.

Actual results:
The number of open directory (/var/lib/rsyslog) keep growing.

96
96
99      <- add 3
99
99
99
99
99
99
102    <- add 3

Expected results:
Number of open files by rsyslogd should be always low number.

Additional info:

This symptom can be reproduced on rsyslog on RHEL7,
and also rsyslog-8.2010.0-1.fc33.x86_64.