AWS: increase io1 volume IOPs limit

Max IOPS for SSD (io1) volumes was increased from 20,000 to 32,000:
https://aws.amazon.com/about-aws/whats-new/2017/12/amazon-ebs-provisioned-iops-ssd--io1--volumes-now-support-32-000-iops-and-500-mbs-per-volume/

and later to 64,000:
https://aws.amazon.com/about-aws/whats-new/2018/11/amazon-elastic-block-store-announces-double-the-performance-of-provisioned-iops-volumes/

Author: philjb

pkg/volume/awsebs/aws_util.go

@@ -176,7 +176,7 @@ func populateVolumeOptions(pluginName, pvcName string, capacityGB resource.Quant
 		case "iopspergb":
 			volumeOptions.IOPSPerGB, err = strconv.Atoi(v)
 			if err != nil {
-				return nil, fmt.Errorf("invalid iopsPerGB value %q, must be integer between 1 and 30: %v", v, err)
+				return nil, fmt.Errorf("invalid iopsPerGB value %q: %v", v, err)
 			}
 		case "encrypted":
 			volumeOptions.Encrypted, err = strconv.ParseBool(v)

staging/src/k8s.io/legacy-cloud-providers/aws/aws.go

@@ -427,7 +427,7 @@ const (
 // Source: http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/EBSVolumeTypes.html
 const (
 	MinTotalIOPS = 100
-	MaxTotalIOPS = 20000
+	MaxTotalIOPS = 64000
 )
 
 // VolumeOptions specifies capacity and tags for a volume.