[rsyslog]: Explicitly set the notify mode for rsyslog imfile module (#…

…6351)

Enable the notify mode of rsyslogd imfile module used for supervisord
logs in docker container. 

Setup the mode="inotify" when loading imfile, made sure we are are getting 
supervisord logs in host immediately.

Signed-off-by: Abhishek Dosi <abdosi@microsoft.com>

dockers/docker-base/etc/rsyslog.d/supervisor.conf

@@ -1,4 +1,4 @@
-module(load="imfile") #By default notify mode
+module(load="imfile" mode="inotify") # Ensure "inotify" mode is used
 $WorkDirectory /var/log/supervisor
 # Start Monitoring the file
 input(type="imfile"