provider/aws: Handle LimitExceededException for subscriber limits

- Updates aws-sdk-go/request for retryer fix
 - Fixes dynamoDB exception handling to catch subscriber limit error

When the `aws-sdk-go` dep releases the next release, we can tag the vendor with the new
release version, and merge this. Until then, soft-updated the vendor solely for the `request` package to post fix.

DynamoDB Fix:
```
aws_dynamodb_table.bar: Creating...
  arn:                       "" => "<computed>"
  attribute.#:               "" => "1"
  attribute.4228504427.name: "" => "id"
  attribute.4228504427.type: "" => "S"
  hash_key:                  "" => "id"
  name:                      "" => "over-cap-test"
  read_capacity:             "" => "5"
  stream_arn:                "" => "<computed>"
  stream_enabled:            "" => "<computed>"
  stream_view_type:          "" => "<computed>"
  write_capacity:            "" => "5"
Error applying plan:

1 error(s) occurred:

* aws_dynamodb_table.bar: 1 error(s) occurred:

* aws_dynamodb_table.bar: AWS Error creating DynamoDB table: LimitExceededException: Subscriber limit exceeded: There is a limit of 256 tables per subscriber
        status code: 400, request id: J2MC7MR060VKBPHP9P6JG5B6Q3VV4KQNSO5AEMVJF66Q9ASUAAJG
```

builtin/providers/aws/resource_aws_dynamodb_table.go

@@ -321,15 +321,20 @@ func resourceAwsDynamoDbTableCreate(d *schema.ResourceData, meta interface{}) er
 		output, err := dynamodbconn.CreateTable(req)
 		if err != nil {
 			if awsErr, ok := err.(awserr.Error); ok {
-				if awsErr.Code() == "ThrottlingException" {
+				switch code := awsErr.Code(); code {
+				case "ThrottlingException":
 					log.Printf("[DEBUG] Attempt %d/%d: Sleeping for a bit to throttle back create request", attemptCount, DYNAMODB_MAX_THROTTLE_RETRIES)
 					time.Sleep(DYNAMODB_THROTTLE_SLEEP)
 					attemptCount += 1
-				} else if awsErr.Code() == "LimitExceededException" {
+				case "LimitExceededException":
+					// If we're at resource capacity, error out without retry
+					if strings.Contains(awsErr.Message(), "Subscriber limit exceeded:") {
+						return fmt.Errorf("AWS Error creating DynamoDB table: %s", err)
+					}
 					log.Printf("[DEBUG] Limit on concurrent table creations hit, sleeping for a bit")
 					time.Sleep(DYNAMODB_LIMIT_EXCEEDED_SLEEP)
 					attemptCount += 1
-				} else {
+				default:
 					// Some other non-retryable exception occurred
 					return fmt.Errorf("AWS Error creating DynamoDB table: %s", err)
 				}

vendor/github.com/aws/aws-sdk-go/aws/request/connection_reset_error.go

@@ -1,4 +1,4 @@
-// +build !appengine
+// +build !appengine,!plan9
 
 package request
 

vendor/github.com/aws/aws-sdk-go/aws/request/connection_reset_error_other.go

@@ -0,0 +1,11 @@
+// +build appengine plan9
+
+package request
+
+import (
+	"strings"
+)
+
+func isErrConnectionReset(err error) bool {
+	return strings.Contains(err.Error(), "connection reset")
+}

vendor/github.com/aws/aws-sdk-go/aws/request/request.go

@@ -368,7 +368,7 @@ func (r *Request) ResetBody() {
 	}
 
 	if l == 0 {
-		r.HTTPRequest.Body = noBodyReader
+		r.HTTPRequest.Body = NoBody
 	} else if l > 0 {
 		r.HTTPRequest.Body = r.safeBody
 	} else {
@@ -382,7 +382,7 @@ func (r *Request) ResetBody() {
 		// a io.Reader that was not also an io.Seeker.
 		switch r.Operation.HTTPMethod {
 		case "GET", "HEAD", "DELETE":
-			r.HTTPRequest.Body = noBodyReader
+			r.HTTPRequest.Body = NoBody
 		default:
 			r.HTTPRequest.Body = r.safeBody
 		}

vendor/github.com/aws/aws-sdk-go/aws/request/request_1_7.go

@@ -16,6 +16,6 @@ func (noBody) Read([]byte) (int, error)         { return 0, io.EOF }
 func (noBody) Close() error                     { return nil }
 func (noBody) WriteTo(io.Writer) (int64, error) { return 0, nil }
 
-// Is an empty reader that will trigger the Go HTTP client to not include
+// NoBody is an empty reader that will trigger the Go HTTP client to not include
 // and body in the HTTP request.
-var noBodyReader = noBody{}
+var NoBody = noBody{}

vendor/github.com/aws/aws-sdk-go/aws/request/request_1_8.go

@@ -2,8 +2,10 @@
 
 package request
 
-import "net/http"
+import (
+	"net/http"
+)
 
-// Is a http.NoBody reader instructing Go HTTP client to not include
+// NoBody is a http.NoBody reader instructing Go HTTP client to not include
 // and body in the HTTP request.
-var noBodyReader = http.NoBody
+var NoBody = http.NoBody

vendor/github.com/aws/aws-sdk-go/aws/request/retryer.go

@@ -38,7 +38,6 @@ var throttleCodes = map[string]struct{}{
 	"ThrottlingException":                    {},
 	"RequestLimitExceeded":                   {},
 	"RequestThrottled":                       {},
-	"LimitExceededException":                 {}, // Deleting 10+ DynamoDb tables at once
 	"TooManyRequestsException":               {}, // Lambda functions
 	"PriorRequestNotComplete":                {}, // Route53
 }

vendor/vendor.json

@@ -621,12 +621,10 @@
 			"versionExact": "v1.8.21"
 		},
 		{
-			"checksumSHA1": "4y3OXdVeAE/Upux6FZp/0T0gAz4=",
+			"checksumSHA1": "dsVwPNbrXbXMAXZY9ZkXG7vR+Oc=",
 			"path": "github.com/aws/aws-sdk-go/aws/request",
-			"revision": "49c7a5e645b5eca5aabd1fd6a676dbddaf7b2a1a",
-			"revisionTime": "2017-05-09T17:42:03Z",
-			"version": "v1.8.21",
-			"versionExact": "v1.8.21"
+			"revision": "fed27f4bd16c8c63d01003b978e5bc85fe727519",
+			"revisionTime": "2017-05-16T23:28:54Z"
 		},
 		{
 			"checksumSHA1": "sxShwDYt1duG922FOwU0/hbu/uc=",