Update lighty-bgp example postman collection

[PeterSuna]

• Fix the "router-id" to localhost, based on the request URL
  where lighty is running.
• Remove unnecessary GET request body.
• Fix "Connect peer" to POST type.
• Add "Connect multiple peers" PUT request to demonstrate adding
  multiple BGP peers at once
• Remove redundant configuration from "Create BGP protocol
  instance" based on the ODL BGP Protocol Configuration documentation.

[gemini-code-assist]

Summary of Changes

Hello @PeterSuna, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request refines the lighty-bgp example Postman collection to enhance its accuracy and ease of use. The changes primarily involve standardizing the target host to localhost, correcting HTTP methods for BGP peer connections, and removing redundant request bodies. A new feature has also been introduced to simplify the process of connecting multiple BGP peers, making the example more robust and functional for local development and testing.

Highlights

• Router ID Update: The BGP router-id in the configuration has been updated to '127.0.0.1' to align with localhost operations.
• Postman Variable Removal: The 'lighty-host' Postman variable has been removed, and all request URLs are now hardcoded to '127.0.0.1:8888' for direct local execution.
• Request Body Cleanup: Unnecessary raw request bodies have been removed from several GET requests, streamlining the collection.
• Connect Peer Method Correction: The 'Connect peer' request method has been corrected from GET to POST, which is the appropriate HTTP verb for this operation.
• New Multiple Peer Connection Request: A new 'Connect MULTIPLE peer' PUT request has been added, allowing for the configuration of several BGP neighbors (127.0.0.2 through 127.0.0.6) simultaneously.
• BGP Peer Group Remote Port Adjustment: The remote-port for the 'external-neighbor' peer group has been changed from '179' to '17900'.

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[gemini-code-assist]

Code Review

The pull request updates the Lighty-BGP example Postman collection. Key changes include fixing the router-id to localhost, removing unnecessary GET request bodies, and correcting the 'Connect peer' request to use the POST method. While these changes align with the stated goals, the removal of the lighty-host variable and subsequent hardcoding of 127.0.0.1:8888 throughout the collection reduces its flexibility and reusability for different environments. Additionally, the removal of extensive <afi-safis> configurations in some requests simplifies the examples but might limit their comprehensiveness.

[ihrasko]

Please complete @PeterSuna.