T7136: sflow check listen address for the vrf

[sever-sever]

Change summary

Add check list to VRF address for the sFlow agent address

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/T7136

Related PR(s)

How to test / Smoketest result

config:

set interfaces ethernet eth2 address '192.168.0.1/24'
set interfaces ethernet eth2 vrf 'OVERLAY'
set system sflow server 192.168.0.10
set system sflow agent-address 192.168.0.1
set system sflow interface eth1
set system sflow vrf 'OVERLAY'
set vrf bind-to-all
set vrf name OVERLAY table '300'
commit

Before fix:

vyos@r14# commit
[ system sflow ]
Configured "sflow agent-address 192.168.0.1" does not exist in the
system!
[[system sflow]] failed
Commit failed
[edit]
vyos@r14# 

After this fix commit without issues.

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

[github-actions]

👍
No issues in PR Title / Commit Title

[github-actions]

CI integration ❌ failed!

Details

CI logs

• CLI Smoketests (no interfaces) ❌ failed
• CLI Smoketests (interfaces only) ❌ failed
• Config tests 👍 passed
• RAID1 tests 👍 passed
• TPM tests 👍 passed