AWS: Use GiB as units for disk sizes.

From some reason, MiBs were used for public functions and AWS cloud provider
recalculated them to GiB. Let's expose what AWS really supports and don't hide
real allocation units.

test/e2e/pd.go

@@ -18,11 +18,12 @@ package e2e
 
 import (
 	"fmt"
-	"google.golang.org/api/googleapi"
 	mathrand "math/rand"
 	"strings"
 	"time"
 
+	"google.golang.org/api/googleapi"
+
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
 	"k8s.io/kubernetes/pkg/api"
@@ -326,7 +327,7 @@ func createPD() (string, error) {
 			return "", fmt.Errorf("Provider does not support volumes")
 		}
 		volumeOptions := &awscloud.VolumeOptions{}
-		volumeOptions.CapacityMB = 10 * 1024
+		volumeOptions.CapacityGB = 10
 		return volumes.CreateVolume(volumeOptions)
 	}
 }