Bump AWS SDK

Fixes https://github.com/docker/distribution/issues/3097

Signed-off-by: Yong Wen Chua <lawliet89@users.noreply.github.com>

vendor/github.com/aws/aws-sdk-go/private/protocol/host_prefix.go

@@ -0,0 +1,54 @@
+package protocol
+
+import (
+	"strings"
+
+	"github.com/aws/aws-sdk-go/aws"
+	"github.com/aws/aws-sdk-go/aws/request"
+)
+
+// HostPrefixHandlerName is the handler name for the host prefix request
+// handler.
+const HostPrefixHandlerName = "awssdk.endpoint.HostPrefixHandler"
+
+// NewHostPrefixHandler constructs a build handler
+func NewHostPrefixHandler(prefix string, labelsFn func() map[string]string) request.NamedHandler {
+	builder := HostPrefixBuilder{
+		Prefix:   prefix,
+		LabelsFn: labelsFn,
+	}
+
+	return request.NamedHandler{
+		Name: HostPrefixHandlerName,
+		Fn:   builder.Build,
+	}
+}
+
+// HostPrefixBuilder provides the request handler to expand and prepend
+// the host prefix into the operation's request endpoint host.
+type HostPrefixBuilder struct {
+	Prefix   string
+	LabelsFn func() map[string]string
+}
+
+// Build updates the passed in Request with the HostPrefix template expanded.
+func (h HostPrefixBuilder) Build(r *request.Request) {
+	if aws.BoolValue(r.Config.DisableEndpointHostPrefix) {
+		return
+	}
+
+	var labels map[string]string
+	if h.LabelsFn != nil {
+		labels = h.LabelsFn()
+	}
+
+	prefix := h.Prefix
+	for name, value := range labels {
+		prefix = strings.Replace(prefix, "{"+name+"}", value, -1)
+	}
+
+	r.HTTPRequest.URL.Host = prefix + r.HTTPRequest.URL.Host
+	if len(r.HTTPRequest.Host) > 0 {
+		r.HTTPRequest.Host = prefix + r.HTTPRequest.Host
+	}
+}