Add iperf3 extra-software package for AutoHCK

iperf/.gitignore

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+*
+!.gitignore
+!config.json
+!install.ps1
+!README.md

iperf/README.md

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+# iperf3 for AutoHCK
+
+Windows iperf3 v3.17.1 (amd64) for NetKVM functest throughput and RSS cases.
+
+## Layout
+
+```
+iperf/
+  config.json
+  install.ps1
+  iperf3-win.zip         # not in git — AutoHCK downloads on first use
+```
+
+Guest install: `C:\iperf\iperf3.exe` on machine PATH.
+
+Host setup: Linux `iperf3` is configured in AutoHCK test case pre_test_commands.
+
+## Usage
+
+```json
+"extra_software": ["iperf"]
+```
+
+Source: https://github.com/ar51an/iperf3-win-builds/releases/tag/3.17.1

iperf/config.json

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+{
+    "download_url": "https://github.com/ar51an/iperf3-win-builds/releases/download/3.17.1/iperf-3.17.1-win64.zip",
+    "file_name": "iperf3-win.zip",
+    "install_cmd": "powershell",
+    "install_args": "-ExecutionPolicy Bypass -File @sw_path@\\install.ps1",
+    "install_dest": "client",
+    "install_time": {
+        "kit": "after",
+        "driver": "before"
+    }
+}

iperf/install.ps1

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+$ErrorActionPreference = 'Stop'
+$SrcDir = $PSScriptRoot
+$InstallDir = 'C:\iperf'
+$ZipFile = Join-Path $SrcDir 'iperf3-win.zip'
+
+if (-not (Test-Path $ZipFile)) {
+    Write-Output "FAIL: iperf3-win.zip not found at $ZipFile"
+    exit 1
+}
+
+$TempDir = Join-Path $env:TEMP ("iperf3_extract_" + [guid]::NewGuid().ToString())
+New-Item -ItemType Directory -Path $TempDir -Force | Out-Null
+try {
+    Expand-Archive -LiteralPath $ZipFile -DestinationPath $TempDir -Force
+    $exe = Get-ChildItem -Path $TempDir -Recurse -Filter 'iperf3.exe' | Select-Object -First 1
+    if (-not $exe) {
+        Write-Output 'FAIL: iperf3.exe not found inside zip'
+        exit 1
+    }
+    New-Item -ItemType Directory -Path $InstallDir -Force | Out-Null
+    Copy-Item -LiteralPath $exe.FullName -Destination (Join-Path $InstallDir 'iperf3.exe') -Force
+    $dll = Get-ChildItem -Path $TempDir -Recurse -Filter 'cygwin1.dll' | Select-Object -First 1
+    if ($dll) {
+        Copy-Item -LiteralPath $dll.FullName -Destination (Join-Path $InstallDir 'cygwin1.dll') -Force
+    }
+} finally {
+    Remove-Item -LiteralPath $TempDir -Recurse -Force -ErrorAction SilentlyContinue
+}
+
+$machinePath = [Environment]::GetEnvironmentVariable('Path', 'Machine')
+$parts = @()
+if (-not [string]::IsNullOrEmpty($machinePath)) {
+    $parts = @($machinePath -split ';' | Where-Object { $_ -ne '' })
+}
+if ($parts -notcontains $InstallDir) {
+    [Environment]::SetEnvironmentVariable('Path', ($InstallDir + ';' + $machinePath), 'Machine')
+}
+
+Write-Output "PASS: iperf3 installed ($InstallDir)"
+exit 0