Fixed Await UP status for TestCaseTC5Shutdown and updated lastchange status check

[priyaranjannanda]

Changes to update TestCaseTC5Shutdown adding

• gnmi.watch for UP status check for interface
• updated lastchange status check for >= for time check

[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 improves the reliability of the 'TestCaseTC5Shutdown' test by refining how interface status and timing are validated. By incorporating a polling mechanism for the 'UP' status and adjusting the comparison logic for state changes, the test is now more resilient to minor timing variations in the network environment.

Highlights

• Interface Status Verification: Added a gnmi.Watch call to ensure the interface status reaches the 'UP' state before proceeding with test assertions.
• LastChange Comparison Logic: Updated the comparison operator for 'LastChange' from equality to greater-than-or-equal-to to better handle timestamp updates.
• Test Stability: Introduced a 500ms sleep period to allow the network stack to settle after bringing the OTG interface back up.

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[OpenConfigBot]

Pull Request Functional Test Report for #5486 / 7b948fa

Virtual Devices

Device	Test	Test Documentation	Job	Raw Log
Arista cEOS		RT-5.5: Interface hold-time
Cisco 8000E		RT-5.5: Interface hold-time
Cisco XRd		RT-5.5: Interface hold-time
Juniper ncPTX		RT-5.5: Interface hold-time
Nokia SR Linux		RT-5.5: Interface hold-time
Openconfig Lemming		RT-5.5: Interface hold-time

Hardware Devices

Device	Test	Test Documentation	Raw Log
Arista 7808		RT-5.5: Interface hold-time
Cisco 8808		RT-5.5: Interface hold-time
Juniper PTX10008		RT-5.5: Interface hold-time
Nokia 7250 IXR-10e		RT-5.5: Interface hold-time

Help

[gemini-code-assist]

Code Review

This pull request introduces a delay and a gnmi.Watch operation to wait for the interface to settle after being brought up, and modifies the comparison logic for the interface's LastChange timestamp. Feedback highlights a critical logic error where changing the timestamp comparison from equality to 'greater-than-or-equal' invalidates the test's intent to verify flap suppression. Additionally, the reviewer pointed out potential nil pointer dereferences and formatting inconsistencies in the newly added gnmi.Watch block that violate Go style guidelines.