Improve sudo cat command for RO user. (#14428) (#14437)

Improve sudo cat command for RO user.
Manually cherry-pick for #14428

Author: liuh-80

files/image_config/sudoers/sudoers

@@ -40,7 +40,7 @@ Cmnd_Alias      READ_ONLY_CMDS = /sbin/brctl show, \
                                  /usr/bin/vtysh -c show bgp ipv[46] summary json, \
                                  /usr/bin/vtysh -n [0-9] -c show version, \
                                  /bin/ip netns identify [0-9]*, \
-                                 /bin/cat /var/log/syslog*, \
+                                 /bin/cat /var/log/syslog, /bin/cat /var/log/syslog.1 /var/log/syslog, /bin/cat /var/log/syslog.1, \
                                  /usr/bin/tail -F /var/log/syslog
 
 Cmnd_Alias      PASSWD_CMDS = /usr/bin/config tacacs passkey *, \