provider/azurerm: Add `azurerm_virtual_machine` Acceptance Test for (#7456)

`storage_data_disk`

```
make testacc TEST=./builtin/providers/azurerm TESTARGS='-run=TestAccAzureRMVirtualMachine_withDataDisk'
==> Checking that code complies with gofmt requirements...
/Users/stacko/Code/go/bin/stringer
go generate $(go list ./... | grep -v /vendor/)
2016/07/01 15:47:13 Generated command/internal_plugin_list.go
TF_ACC=1 go test ./builtin/providers/azurerm -v
-run=TestAccAzureRMVirtualMachine_withDataDisk -timeout 120m
=== RUN   TestAccAzureRMVirtualMachine_withDataDisk
--- PASS: TestAccAzureRMVirtualMachine_withDataDisk (575.39s)
PASS
ok      github.com/hashicorp/terraform/builtin/providers/azurerm
```

builtin/providers/azurerm/resource_arm_virtual_machine_test.go

@@ -28,6 +28,24 @@ func TestAccAzureRMVirtualMachine_basicLinuxMachine(t *testing.T) {
 	})
 }
 
+func TestAccAzureRMVirtualMachine_withDataDisk(t *testing.T) {
+	ri := acctest.RandInt()
+	config := fmt.Sprintf(testAccAzureRMVirtualMachine_withDataDisk, ri, ri, ri, ri, ri, ri, ri)
+	resource.Test(t, resource.TestCase{
+		PreCheck:     func() { testAccPreCheck(t) },
+		Providers:    testAccProviders,
+		CheckDestroy: testCheckAzureRMVirtualMachineDestroy,
+		Steps: []resource.TestStep{
+			{
+				Config: config,
+				Check: resource.ComposeTestCheckFunc(
+					testCheckAzureRMVirtualMachineExists("azurerm_virtual_machine.test"),
+				),
+			},
+		},
+	})
+}
+
 func TestAccAzureRMVirtualMachine_tags(t *testing.T) {
 	ri := acctest.RandInt()
 	preConfig := fmt.Sprintf(testAccAzureRMVirtualMachine_basicLinuxMachine, ri, ri, ri, ri, ri, ri, ri)
@@ -291,6 +309,102 @@ resource "azurerm_virtual_machine" "test" {
 }
 `
 
+var testAccAzureRMVirtualMachine_withDataDisk = `
+resource "azurerm_resource_group" "test" {
+    name = "acctestrg-%d"
+    location = "West US"
+}
+
+resource "azurerm_virtual_network" "test" {
+    name = "acctvn-%d"
+    address_space = ["10.0.0.0/16"]
+    location = "West US"
+    resource_group_name = "${azurerm_resource_group.test.name}"
+}
+
+resource "azurerm_subnet" "test" {
+    name = "acctsub-%d"
+    resource_group_name = "${azurerm_resource_group.test.name}"
+    virtual_network_name = "${azurerm_virtual_network.test.name}"
+    address_prefix = "10.0.2.0/24"
+}
+
+resource "azurerm_network_interface" "test" {
+    name = "acctni-%d"
+    location = "West US"
+    resource_group_name = "${azurerm_resource_group.test.name}"
+
+    ip_configuration {
+    	name = "testconfiguration1"
+    	subnet_id = "${azurerm_subnet.test.id}"
+    	private_ip_address_allocation = "dynamic"
+    }
+}
+
+resource "azurerm_storage_account" "test" {
+    name = "accsa%d"
+    resource_group_name = "${azurerm_resource_group.test.name}"
+    location = "westus"
+    account_type = "Standard_LRS"
+
+    tags {
+        environment = "staging"
+    }
+}
+
+resource "azurerm_storage_container" "test" {
+    name = "vhds"
+    resource_group_name = "${azurerm_resource_group.test.name}"
+    storage_account_name = "${azurerm_storage_account.test.name}"
+    container_access_type = "private"
+}
+
+resource "azurerm_virtual_machine" "test" {
+    name = "acctvm-%d"
+    location = "West US"
+    resource_group_name = "${azurerm_resource_group.test.name}"
+    network_interface_ids = ["${azurerm_network_interface.test.id}"]
+    vm_size = "Standard_A0"
+
+    storage_image_reference {
+	publisher = "Canonical"
+	offer = "UbuntuServer"
+	sku = "14.04.2-LTS"
+	version = "latest"
+    }
+
+    storage_os_disk {
+        name = "myosdisk1"
+        vhd_uri = "${azurerm_storage_account.test.primary_blob_endpoint}${azurerm_storage_container.test.name}/myosdisk1.vhd"
+        caching = "ReadWrite"
+        create_option = "FromImage"
+    }
+
+    storage_data_disk {
+        name          = "mydatadisk1"
+        vhd_uri       = "${azurerm_storage_account.test.primary_blob_endpoint}${azurerm_storage_container.test.name}/mydatadisk1.vhd"
+    	disk_size_gb  = "1023"
+    	create_option = "Empty"
+    	lun           = 0
+    }
+
+    os_profile {
+	computer_name = "hostname%d"
+	admin_username = "testadmin"
+	admin_password = "Password1234!"
+    }
+
+    os_profile_linux_config {
+	disable_password_authentication = false
+    }
+
+    tags {
+    	environment = "Production"
+    	cost-center = "Ops"
+    }
+}
+`
+
 var testAccAzureRMVirtualMachine_basicLinuxMachineUpdated = `
 resource "azurerm_resource_group" "test" {
     name = "acctestrg-%d"