T5110: Fix op-mode FRR vtysh_pam account validation

[sever-sever]

Change Summary

With FRR 8.5, there exists the file /etc/pam.d/frr
With this file, by default, we have cosmetic error for any op-mode command

$ show ip bgp
vtysh_pam: Failed in account validation: Success(0)No BGP prefixes displayed, 0 exist

Fix it

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Code style update (formatting, renaming)
• Refactoring (no functional changes)
• Migration from an old Vyatta component to vyos-1x, please link to related PR inside obsoleted component
• Other (please describe):

Related Task(s)

• https://vyos.dev/T5110

Component(s) name

pam.d

Proposed changes

How to test

Before fix:

vyos@vyos:~$ cat /etc/pam.d/frr
# Any user may call vtysh but only those belonging to the group frrvty can
# actually connect to the socket and use the program.
auth	sufficient	pam_permit.so
account	sufficient	pam_rootok.so

FRR any op-mode command:

vyos@r14:~$ show ip bgp 
vtysh_pam: Failed in account validation: Success(0)No BGP prefixes displayed, 0 exist
vyos@r14:~$

After the fix:

vyos@r14:~$ sudo cat /etc/pam.d/frr 
# Any user may call vtysh but only those belonging to the group frrvty can
# actually connect to the socket and use the program.
auth	sufficient	pam_permit.so
account	sufficient	pam_permit.so
vyos@r14:~$ 
vyos@r14:~$ 
vyos@r14:~$ show ip bgp
No BGP prefixes displayed, 0 exist
vyos@r14:~$ 

Checklist:

• I have read the CONTRIBUTING document
• I have linked this PR to one or more Phabricator Task(s)
• I have run the components SMOKETESTS if applicable
• My commit headlines contain a valid Task id
• My change requires a change to the documentation
• I have updated the documentation accordingly