move mtu test to proper folder

[dplore]

MTU test folder should roughly follow the openconfig schema:

/interfaces/interface/config/mtu

[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 refactors the directory structure for MTU-related tests by relocating them to a more semantically appropriate path. The change ensures that the test folder hierarchy mirrors the OpenConfig schema for interface MTU, enhancing discoverability and maintainability for future development and testing efforts without altering any test logic.

Highlights

• File Restructuring: Moved all MTU-related test files and their associated metadata to a new directory path, feature/interface/mtu/..., to align with the OpenConfig schema for interface MTU configuration.

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[OpenConfigBot]

Pull Request Functional Test Report for #5239 / f522ace

Virtual Devices

Device	Test	Test Documentation	Job	Raw Log
Arista cEOS		MTU-1.3: Large IP Packet Transmission MTU-1.5: Path MTU handing MTU-1.4: Large IP Packet through GRE/GUE tunnel Transmission	d2386c2c	Log
Cisco 8000E		MTU-1.3: Large IP Packet Transmission MTU-1.5: Path MTU handing MTU-1.4: Large IP Packet through GRE/GUE tunnel Transmission	e52e0a5d	Log
Cisco XRd		MTU-1.3: Large IP Packet Transmission MTU-1.5: Path MTU handing MTU-1.4: Large IP Packet through GRE/GUE tunnel Transmission	ab72fc8e	Log
Juniper ncPTX		MTU-1.3: Large IP Packet Transmission MTU-1.5: Path MTU handing MTU-1.4: Large IP Packet through GRE/GUE tunnel Transmission	3f78c7df	Log
Nokia SR Linux		MTU-1.3: Large IP Packet Transmission MTU-1.5: Path MTU handing MTU-1.4: Large IP Packet through GRE/GUE tunnel Transmission	17c22514	Log
Openconfig Lemming		MTU-1.3: Large IP Packet Transmission MTU-1.5: Path MTU handing MTU-1.4: Large IP Packet through GRE/GUE tunnel Transmission	a0a1bb50	Log

Hardware Devices

Device	Test	Test Documentation	Raw Log
Arista 7808		MTU-1.3: Large IP Packet Transmission MTU-1.5: Path MTU handing MTU-1.4: Large IP Packet through GRE/GUE tunnel Transmission
Cisco 8808		MTU-1.3: Large IP Packet Transmission MTU-1.5: Path MTU handing MTU-1.4: Large IP Packet through GRE/GUE tunnel Transmission
Juniper PTX10008		MTU-1.3: Large IP Packet Transmission MTU-1.5: Path MTU handing MTU-1.4: Large IP Packet through GRE/GUE tunnel Transmission
Nokia 7250 IXR-10e		MTU-1.3: Large IP Packet Transmission MTU-1.5: Path MTU handing MTU-1.4: Large IP Packet through GRE/GUE tunnel Transmission

Help

[gemini-code-assist]

Code Review

This pull request introduces or updates test cases, READMEs, and metadata files related to MTU (Maximum Transmission Unit) handling within OTG (Open Traffic Generator) tests. Specifically, it addresses scenarios involving large IP packet transmission, including those with GRE/GUE tunnels, and PMTU (Path MTU) handling. No specific code changes or review comments were provided for detailed analysis.