Move storagedriver package to registry/storage/driver

This change is slightly more complex than previous package maves in that the
package name changed. To address this, we simply always reference the package
driver as storagedriver to avoid compatbility issues with existing code. While
unfortunate, this can be cleaned up over time.

Signed-off-by: Stephen J Day <stephen.day@docker.com>

docs/storage/driver/azure/azure_test.go

@@ -0,0 +1,65 @@
+package azure
+
+import (
+	"fmt"
+	"os"
+	"strings"
+	"testing"
+
+	storagedriver "github.com/docker/distribution/registry/storage/driver"
+	"github.com/docker/distribution/registry/storage/driver/testsuites"
+	. "gopkg.in/check.v1"
+)
+
+const (
+	envAccountName = "AZURE_STORAGE_ACCOUNT_NAME"
+	envAccountKey  = "AZURE_STORAGE_ACCOUNT_KEY"
+	envContainer   = "AZURE_STORAGE_CONTAINER"
+)
+
+// Hook up gocheck into the "go test" runner.
+func Test(t *testing.T) { TestingT(t) }
+
+func init() {
+	var (
+		accountName string
+		accountKey  string
+		container   string
+	)
+
+	config := []struct {
+		env   string
+		value *string
+	}{
+		{envAccountName, &accountName},
+		{envAccountKey, &accountKey},
+		{envContainer, &container},
+	}
+
+	missing := []string{}
+	for _, v := range config {
+		*v.value = os.Getenv(v.env)
+		if *v.value == "" {
+			missing = append(missing, v.env)
+		}
+	}
+
+	azureDriverConstructor := func() (storagedriver.StorageDriver, error) {
+		return New(accountName, accountKey, container)
+	}
+
+	// Skip Azure storage driver tests if environment variable parameters are not provided
+	skipCheck := func() string {
+		if len(missing) > 0 {
+			return fmt.Sprintf("Must set %s environment variables to run Azure tests", strings.Join(missing, ", "))
+		}
+		return ""
+	}
+
+	testsuites.RegisterInProcessSuite(azureDriverConstructor, skipCheck)
+	// testsuites.RegisterIPCSuite(driverName, map[string]string{
+	// 	paramAccountName: accountName,
+	// 	paramAccountKey:  accountKey,
+	// 	paramContainer:   container,
+	// }, skipCheck)
+}