update aws-sdk to support new region

vendor/github.com/aws/aws-sdk-go/service/ec2/customizations.go

@@ -5,11 +5,64 @@ import (
 
 	"github.com/aws/aws-sdk-go/aws"
 	"github.com/aws/aws-sdk-go/aws/awsutil"
+	"github.com/aws/aws-sdk-go/aws/client"
 	"github.com/aws/aws-sdk-go/aws/endpoints"
 	"github.com/aws/aws-sdk-go/aws/request"
+	"github.com/aws/aws-sdk-go/internal/sdkrand"
 )
 
+type retryer struct {
+	client.DefaultRetryer
+}
+
+func (d retryer) RetryRules(r *request.Request) time.Duration {
+	switch r.Operation.Name {
+	case opModifyNetworkInterfaceAttribute:
+		fallthrough
+	case opAssignPrivateIpAddresses:
+		return customRetryRule(r)
+	default:
+		return d.DefaultRetryer.RetryRules(r)
+	}
+}
+
+func customRetryRule(r *request.Request) time.Duration {
+	retryTimes := []time.Duration{
+		time.Second,
+		3 * time.Second,
+		5 * time.Second,
+	}
+
+	count := r.RetryCount
+	if count >= len(retryTimes) {
+		count = len(retryTimes) - 1
+	}
+
+	minTime := int(retryTimes[count])
+	return time.Duration(sdkrand.SeededRand.Intn(minTime) + minTime)
+}
+
+func setCustomRetryer(c *client.Client) {
+	maxRetries := aws.IntValue(c.Config.MaxRetries)
+	if c.Config.MaxRetries == nil || maxRetries == aws.UseServiceDefaultRetries {
+		maxRetries = 3
+	}
+
+	c.Retryer = retryer{
+		DefaultRetryer: client.DefaultRetryer{
+			NumMaxRetries: maxRetries,
+		},
+	}
+}
+
 func init() {
+	initClient = func(c *client.Client) {
+		if c.Config.Retryer == nil {
+			// Only override the retryer with a custom one if the config
+			// does not already contain a retryer
+			setCustomRetryer(c)
+		}
+	}
 	initRequest = func(r *request.Request) {
 		if r.Operation.Name == opCopySnapshot { // fill the PresignedURL parameter
 			r.Handlers.Build.PushFront(fillPresignedURL)