azure-arm builder: Create keyvaults with SoftDelete enabled

builder/azure/arm/template_factory_test.TestKeyVaultDeployment03.approved.json

@@ -38,6 +38,7 @@
             "tenantId": "[parameters('tenantId')]"
           }
         ],
+        "enableSoftDelete": "true",
         "enabledForDeployment": "true",
         "enabledForTemplateDeployment": "true",
         "sku": {

builder/azure/common/template/template.go

@@ -85,6 +85,7 @@ type Properties struct {
 	DNSSettings                  *network.PublicIPAddressDNSSettings `json:"dnsSettings,omitempty"`
 	EnabledForDeployment         *string                             `json:"enabledForDeployment,omitempty"`
 	EnabledForTemplateDeployment *string                             `json:"enabledForTemplateDeployment,omitempty"`
+	EnableSoftDelete             *string                             `json:"enableSoftDelete,omitempty"`
 	HardwareProfile              *compute.HardwareProfile            `json:"hardwareProfile,omitempty"`
 	IPConfigurations             *[]network.IPConfiguration          `json:"ipConfigurations,omitempty"`
 	NetworkProfile               *compute.NetworkProfile             `json:"networkProfile,omitempty"`

builder/azure/common/template/template_builder.go

@@ -554,6 +554,7 @@ const KeyVault = `{
       "properties": {
         "enabledForDeployment": "true",
         "enabledForTemplateDeployment": "true",
+        "enableSoftDelete": "true",
         "tenantId": "[parameters('tenantId')]",
         "accessPolicies": [
           {