Updating supervisor switchover test as per readme modifications

[rohit-rp]

• Modified the readme to reduce number of progr ammed prefixes from 50 to 25
  • Originally only 1 prefix was being programmed
  • I had updated the readme to include 50 prefixes in this PR but 25 seems to work efficiently
• Updated the test as per the README changes
• b/514766988 has the pass logs on MFF hardware for all vendors

[gemini-code-assist]

Summary of Changes

Hello, 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 updates the supervisor failure test suite to better align with the specified test documentation. It modifies the scale of the test by reducing the number of prefixes used and expands the test coverage to include IPv6 validation. Additionally, the test structure has been refactored to support a multi-phase validation approach, ensuring that FIB entries persist correctly across supervisor switchovers and that post-switchover programming functions as expected.

Highlights

• Test Logic Update: Updated the supervisor switchover test to align with README requirements, reducing the number of IPv4 and IPv6 entries from 50 to 25 each.
• Test Coverage Expansion: Added support for IPv6 traffic flows and implemented a two-phase validation process covering both pre- and post-switchover FIB programming.
• Code Refactoring: Introduced helper functions for route programming (programRoutes) and AFT telemetry verification (verifyAftTelemetry) to improve test readability and maintainability.

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[OpenConfigBot]

Pull Request Functional Test Report for #5488 / daa02ce

Virtual Devices

Device	Test	Test Documentation	Job	Raw Log
Arista cEOS		TE-8.2: Supervisor Failure	2cf71528	Log
Cisco 8000E		TE-8.2: Supervisor Failure	bb5563eb	Log
Cisco XRd		TE-8.2: Supervisor Failure	6839b969	Log
Juniper ncPTX		TE-8.2: Supervisor Failure	863e6cbb	Log
Nokia SR Linux		TE-8.2: Supervisor Failure	0813d364	Log
Openconfig Lemming		TE-8.2: Supervisor Failure	82146afe	Log

Hardware Devices

Device	Test	Test Documentation	Raw Log
Arista 7808		TE-8.2: Supervisor Failure
Cisco 8808		TE-8.2: Supervisor Failure
Juniper PTX10008		TE-8.2: Supervisor Failure
Nokia 7250 IXR-10e		TE-8.2: Supervisor Failure

Help

[gemini-code-assist]

Code Review

This pull request enhances the supervisor failure test by adding IPv6 support and refactoring the route programming and traffic verification logic. Key changes include updating the test documentation, introducing specific traffic flows for IPv4 and IPv6 across initial and post-switchover phases, and utilizing helper functions for AFT telemetry validation. The number of prefixes programmed in each phase has been adjusted to 25 for each IP version. I have no feedback to provide.