[neighbor_advertiser] Use existing tunnel if present for creating tunnel mappings #1589
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What I did
Check for existing tunnels and use them if present while creating tunnel mappings
How I did it
Modify the neighbor_advertiser script logic
How to verify it
Unittest has been updated
Previous command output (if the output of a command-line utility has changed)
New command output (if the output of a command-line utility has changed)