Set "interface vlanX" 'suppress_vlan_neigh' option

[aida-shumburo]

SUMMARY

Set up the new 'suppress_vlan_neigh' option for vxlans.

GitHub Issues

"N/A".

ISSUE TYPE

• Feature Pull Request

COMPONENT NAME

sonic_vxlans

OUTPUT

Ansible Report:

suppress_vlan_neigh.pdf

Raw Regression Test Output:

suppress_vlan_neigh.txt

Checklist:

• I have performed a self-review of my own code to ensure there are no formatting, linting, or security issues
• I have verified that new and existing unit tests pass locally with my changes
• I have not allowed coverage numbers to degenerate
• I have maintained at least 90% code coverage
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• I have maintained backward compatibility or have provided any relevant "breaking_changes" descriptions in a "fragment" file in the "changelogs/fragments" directory of this repository.
• I have provided a summary for this PR in valid "fragment" file format in the "changelogs/fragments" directory of this repository branch. Reference : Ansible Change Log Document

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Please also list any relevant details for your test configuration

• I ran different ansible playbooks to test that the new 'suppress_vlan_neigh' option value is being merged, replaced, deleted, and overriden the correct way.
• Ran a regression test (attached above)