Fixing tls_authentication_over_grpc_test for Arista

[ram-mac]

Following changes were done for Arista, Juniper and Cisco
1.Arista-specific user creation in the createNativeUser function. It now uses a native EOS CLI command to create the user with privilege 15 and the network-admin role, which is required for gNMI configuration operations.
2.Juniper specifc user creation was added to the function as it is required. Otherwise the SSH authentication would fail. However, juniper still fails for metadata authentication. It will be fixed in another PR.
3.Cleanup the test after the run is over. After changing the hostname via gnmi.set, the test was not reverted back to original form. So added a defer function
4.Cisco does not support the gnmi.replace for system/hostname, so have added the code to handle the defer function accordingly.

[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 introduces support for Arista devices within the TLS authentication over gRPC test suite. It modifies the user creation logic to utilize native EOS CLI commands, ensuring that users are correctly provisioned with the necessary privileges and roles required for gNMI configuration operations.

Highlights

• Arista Platform Support: Added a specific case for Arista devices in the createNativeUser function to handle user creation via CLI.
• Metadata Update: Updated the test metadata to include ARISTA as a platform exception for the set_native_user deviation.

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[OpenConfigBot]

Pull Request Functional Test Report for #5273 / cbb7193

Virtual Devices

Device	Test	Test Documentation	Job	Raw Log
Arista cEOS		SEC-3.1: Authentication	92670f4d	Log
Cisco 8000E		SEC-3.1: Authentication	860c7330	Log
Cisco XRd		SEC-3.1: Authentication	526e6ceb	Log
Juniper ncPTX		SEC-3.1: Authentication	a6003064	Log
Nokia SR Linux		SEC-3.1: Authentication	ba5194b8	Log
Openconfig Lemming		SEC-3.1: Authentication	257c5219	Log

Hardware Devices

Device	Test	Test Documentation	Raw Log
Arista 7808		SEC-3.1: Authentication
Cisco 8808		SEC-3.1: Authentication
Juniper PTX10008		SEC-3.1: Authentication
Nokia 7250 IXR-10e		SEC-3.1: Authentication

Help

[gemini-code-assist]

Code Review

This pull request adds support for Arista devices in the TLS authentication over gRPC test. It updates the metadata.textproto to include a platform exception for Arista and modifies the createNativeUser function in the Go test file to implement Arista-specific CLI configuration for user creation. I have no feedback to provide.