Configurable wire server ip address

[adjordjevic-microsoft]

Reason for Change:
The NMAgent supported APIs URL used in the CNI multitenancy path was previously hardcoded to the well-known Azure Wire Server IP (168.63.129.16). This made it impossible to test CNI changes on OneBox environments where the Wire Server is not reachable at that address.

This PR makes the Wire Server IP configurable via the CNI conflist configuration ("wireServerIP" field), allowing operators and developers to override it for testing in non-standard environments (e.g., OneBox, custom labs). When unset, the default 168.63.129.16 is used, preserving full backward compatibility.

Changes:

• Added WireServerIP field to NetworkConfig in cni/netconfig.go
• Extracted the NMAgent URL construction into a pure function buildNmAgentSupportedApisURL() in cni/network/network.go
• Introduced a defaultWireServerIP constant for the well-known Azure Wire Server IP
• Called buildNmAgentSupportedApisURL(nwCfg.WireServerIP) in the Add() multitenancy path, passing the result as a local variable to DetermineSnatFeatureOnHost
• Added unit tests for buildNmAgentSupportedApisURL in cni/network/network_test.go

Example conflist snippet to override:

{
  "wireServerIP": "10.0.0.1:8080"
}

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[Copilot]

Pull request overview

This PR makes the Wire Server IP used to query NMAgent “GetSupportedApis” configurable via CNI conflist (wireServerIP), defaulting to the well-known Azure Wire Server IP when unset—enabling OneBox/non-standard environment testing without breaking existing behavior.

Changes:

• Adds wireServerIP to CNI NetworkConfig.
• Refactors NMAgent supported-APIs URL construction into buildNmAgentSupportedApisURL() with a defaultWireServerIP.
• Updates the multitenancy Add() path to use the configurable URL and adds unit tests.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
cni/netconfig.go	Adds wireServerIP field to allow configuring the Wire Server address via conflist.
cni/network/network.go	Introduces default + helper function for NMAgent URL construction; uses it in multitenancy Add() flow.
cni/network/network_test.go	Adds unit tests for the NMAgent supported-APIs URL builder.

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[timraymond]

Why not use our nmagent.Client for this? https://github.com/Azure/azure-container-networking/blob/master/nmagent/client.go#L188

[adjordjevic-microsoft]

I looked into using nmagent.Client here, but nmagent.Client.SupportedAPIs() doesn't return a URL, it makes the full HTTP call and returns parsed results. Using it here would require changing the DetermineSnatFeatureOnHost interface, implementation, and mock. Since this is just to make the Wire Server IP configurable for local OneBox testing, I kept the change minimal - just making the existing hardcoded IP configurable without refactoring the production workflow.