OpenSSH: install as part of VM setup, not WinRM

It appears that executing `Add-WindowsCapability` via WinRM is not
viable, this commit moves the installation of OpenSSH.Server to the
various IaaS pre-boot scrips which are not executed via WinRM.

Author: aramprice

lib/packer/config/azure.rb

@@ -45,7 +45,8 @@ def builders
                 'winrm_use_ssl' => 'true',
                 'winrm_insecure' => 'true',
                 'winrm_timeout' => '1h',
-                'winrm_username' => 'packer'
+                'winrm_username' => 'packer',
+                'custom_script' => 'powershell -ExecutionPolicy Unrestricted -NoProfile -NonInteractive -Command "Add-WindowsCapability -Online -Name (Get-WindowsCapability -Online -Name OpenSSH.Server* | ForEach-Object Name)"'
             }
         ]
       end

scripts/aws/setup_winrm.txt

@@ -34,5 +34,10 @@ if (-not (Get-Command Enable-WinRM -errorAction SilentlyContinue))
 Write-Log "Invoking WinRM"
 Enable-WinRM
 
+Write-Log "Install OpenSSH.Server"
+Write-Log (Get-WindowsCapability -Online -Name "OpenSSH.Server*" | Format-List | Out-String)
+Add-WindowsCapability -Online -Name (Get-WindowsCapability -Online -Name "OpenSSH.Server*" | ForEach-Object Name)
+Write-Log (Get-WindowsCapability -Online -Name "OpenSSH.Server*" | Format-List | Out-String)
+
 Set-ExecutionPolicy -ExecutionPolicy Bypass -Scope LocalMachine
 </powershell>

scripts/gcp/setup-winrm.ps1

@@ -32,3 +32,8 @@ if (-not (Get-Command Enable-WinRM -errorAction SilentlyContinue))
 
 Write-Log "Invoking WinRM"
 Enable-WinRM
+
+Write-Log "Install OpenSSH.Server"
+Write-Log (Get-WindowsCapability -Online -Name "OpenSSH.Server*" | Format-List | Out-String)
+Add-WindowsCapability -Online -Name (Get-WindowsCapability -Online -Name "OpenSSH.Server*" | ForEach-Object Name)
+Write-Log (Get-WindowsCapability -Online -Name "OpenSSH.Server*" | Format-List | Out-String)