fix for public preview protocol to go through proper in-order steps

Author: henry416

src/ResourceManager/Network/Commands.Network.Test/ScenarioTests/VirtualNetworkGatewayTests.ps1

@@ -658,8 +658,11 @@ function Test-VirtualNetworkGatewayOpenVPN
 		$vnetIpConfig = New-AzureRmVirtualNetworkGatewayIpConfig -Name $vnetGatewayConfigName -PublicIpAddress $publicip -Subnet $subnet
 
 		# Create & Get OpenVPN virtualnetworkgateway
-		New-AzureRmVirtualNetworkGateway -ResourceGroupName $rgname -name $rname -location $location -IpConfigurations $vnetIpConfig -GatewayType Vpn -VpnType RouteBased -EnableBgp $false -GatewaySku VpnGw1 -VpnClientAddressPool 201.169.0.0/16 -VpnClientRootCertificates $rootCert -VpnClientProtocol OpenVPN
+		New-AzureRmVirtualNetworkGateway -ResourceGroupName $rgname -name $rname -location $location -IpConfigurations $vnetIpConfig -GatewayType Vpn -VpnType RouteBased -EnableBgp $false -GatewaySku VpnGw1 -VpnClientAddressPool 201.169.0.0/16 -VpnClientRootCertificates $rootCert
+		$actual = Get-AzureRmVirtualNetworkGateway -ResourceGroupName $rgname -name $rname
+		Set-AzureRmVirtualNetworkGateway -VirtualNetworkGateway $actual -VpnClientProtocol OpenVPN
 		$actual = Get-AzureRmVirtualNetworkGateway -ResourceGroupName $rgname -name $rname
+
 		Assert-AreEqual "VpnGw1" $actual.Sku.Tier
 		$protocols = $actual.VpnClientConfiguration.VpnClientProtocols
 		Assert-AreEqual 1 @($protocols).Count