Improve sudo cat command for RO user. (sonic-net#14428)

Improve sudo cat command for RO user.

#### Why I did it
RO user can use sudo command show none syslog files.

#### How I did it
Improve sudo cat command for RO user.

#### How to verify it
Pass all UT.
Manually check fixed code work correctly.

#### Description for the changelog
Improve sudo cat command for RO user.

files/image_config/sudoers/sudoers

@@ -19,7 +19,7 @@ Defaults        lecture_file = /etc/sudoers.lecture
 
 # Cmnd alias specification
 # Note: bcmcmd is dangerous for users in read only netgroups because it may operate ASIC
-Cmnd_Alias      READ_ONLY_CMDS = /bin/cat /var/log/syslog*, \
+Cmnd_Alias      READ_ONLY_CMDS = /bin/cat /var/log/syslog, /bin/cat /var/log/syslog.1 /var/log/syslog, /bin/cat /var/log/syslog.1, \
                                  /bin/ip netns identify [0-9]*, \
                                  /sbin/brctl show, \
                                  /usr/bin/docker exec snmp cat /etc/snmp/snmpd.conf, \