Chocolatey Helper (#646)

* Add basic choco install wrapper

* Use Install-Choco on mingw

* move azure-cli install to defence

* Rename ChocoInstall to ChocoHelpers

images/win/scripts/ImageHelpers/ChocoHelpers.ps1

@@ -0,0 +1,33 @@
+function Install-Choco {
+    [CmdletBinding()]
+    param(
+        [Parameter(Mandatory)]
+        [string]$install,
+        [int]$retries = 5
+    )
+
+    begin { }
+    process {
+        $condition = $false
+        $count = 0
+        do {
+            Write-Output "running: powershell choco install $install -y"
+            powershell choco install $install -y
+
+            $installed = powershell choco list -lo $install --all
+            $match = (($installed -match "^$install.*").Length -ne 0)
+            if ($match) {
+                Write-Output "package installed: $install"
+                $condition = $true
+            }
+            else {
+                $count++
+                if ($count -eq $retries) {
+                    Write-Error "Could not install $install after $count attempts"
+                    exit 1
+                }
+            }
+        } while ($condition -eq $false)
+    }
+    end { }
+}