snmp: T6489: use new Python wrapper to interact with config filesystem

[c-po]

Change Summary

Do no longer use my_set and my_delete as this prevents scripts beeing run under supervision of vyos-configd.

This is a feature which should not be backported to 1.4!

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/T6489

Related PR(s)

Component(s) name

Proposed changes

How to test

Smoketest result

cpo@LR2.wue3:~$ /usr/libexec/vyos/tests/smoke/cli/test_service_snmp.py
test_snmp_basic (__main__.TestSNMPService.test_snmp_basic) ... ok
test_snmpv3_md5 (__main__.TestSNMPService.test_snmpv3_md5) ... ok
test_snmpv3_sha (__main__.TestSNMPService.test_snmpv3_sha) ... ok
test_snmpv3_view_exclude (__main__.TestSNMPService.test_snmpv3_view_exclude) ... ok

----------------------------------------------------------------------
Ran 4 tests in 23.550s

OK

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

[c-po]

@Mergifyio backport circinus

[mergify]

backport circinus

✅ Backports have been created

• #3716 snmp: T6489: use new Python wrapper to interact with config filesystem (backport #3694) has been created for branch circinus