enable rsyslog to report full domain name of the switch

In our case the name of the switch is its IP address of eth0 interface. Without
this option enabled, only the first octet is reported to remote log server (e.g.
192)

userspace/rootfs_override/etc/rsyslog.conf

@@ -9,6 +9,8 @@
 $ModLoad imuxsock # provides support for local system logging (e.g. via logger command)
 $ModLoad imklog   # kernel logging (formerly provided by rklogd)
 
+$PreserveFQDN on
+
 # Log all kernel messages to the console.
 # Logging much else clutters up the screen.
 #kern.*                                                 /dev/console