diff --git a/vendor/github.com/mitchellh/copystructure/copystructure.go b/vendor/github.com/mitchellh/copystructure/copystructure.go
index 8122bfb77..3f390764e 100644
--- a/vendor/github.com/mitchellh/copystructure/copystructure.go
+++ b/vendor/github.com/mitchellh/copystructure/copystructure.go
@@ -82,6 +82,14 @@ func (c Config) Copy(v interface{}) (interface{}, error) {
 	return result, nil
 }
 
+// Return the key used to index interfaces types we've seen. Store the number
+// of pointers in the upper 32bits, and the depth in the lower 32bits. This is
+// easy to calculate, easy to match a key with our current depth, and we don't
+// need to deal with initializing and cleaning up nested maps or slices.
+func ifaceKey(pointers, depth int) uint64 {
+	return uint64(pointers)<<32 | uint64(depth)
+}
+
 type walker struct {
 	Result interface{}
 
@@ -89,7 +97,16 @@ type walker struct {
 	ignoreDepth int
 	vals        []reflect.Value
 	cs          []reflect.Value
-	ps          []int
+
+	// This stores the number of pointers we've walked over, indexed by depth.
+	ps []int
+
+	// If an interface is indirected by a pointer, we need to know the type of
+	// interface to create when creating the new value.  Store the interface
+	// types here, indexed by both the walk depth and the number of pointers
+	// already seen at that depth. Use ifaceKey to calculate the proper uint64
+	// value.
+	ifaceTypes map[uint64]reflect.Type
 
 	// any locks we've taken, indexed by depth
 	locks []sync.Locker
@@ -119,7 +136,16 @@ func (w *walker) Exit(l reflectwalk.Location) error {
 		defer locker.Unlock()
 	}
 
+	// clear out pointers and interfaces as we exit the stack
 	w.ps[w.depth] = 0
+
+	for k := range w.ifaceTypes {
+		mask := uint64(^uint32(0))
+		if k&mask == uint64(w.depth) {
+			delete(w.ifaceTypes, k)
+		}
+	}
+
 	w.depth--
 	if w.ignoreDepth > w.depth {
 		w.ignoreDepth = 0
@@ -222,6 +248,18 @@ func (w *walker) PointerExit(v bool) error {
 	return nil
 }
 
+func (w *walker) Interface(v reflect.Value) error {
+	if !v.IsValid() {
+		return nil
+	}
+	if w.ifaceTypes == nil {
+		w.ifaceTypes = make(map[uint64]reflect.Type)
+	}
+
+	w.ifaceTypes[ifaceKey(w.ps[w.depth], w.depth)] = v.Type()
+	return nil
+}
+
 func (w *walker) Primitive(v reflect.Value) error {
 	if w.ignoring() {
 		return nil
@@ -312,8 +350,7 @@ func (w *walker) StructField(f reflect.StructField, v reflect.Value) error {
 	// If PkgPath is non-empty, this is a private (unexported) field.
 	// We do not set this unexported since the Go runtime doesn't allow us.
 	if f.PkgPath != "" {
-		w.ignore()
-		return nil
+		return reflectwalk.SkipEntry
 	}
 
 	// Push the field onto the stack, we'll handle it when we exit
@@ -369,6 +406,12 @@ func (w *walker) replacePointerMaybe() {
 
 	v := w.valPop()
 	for i := 1; i < w.ps[w.depth]; i++ {
+		if iType, ok := w.ifaceTypes[ifaceKey(w.ps[w.depth]-i, w.depth)]; ok {
+			iface := reflect.New(iType).Elem()
+			iface.Set(v)
+			v = iface
+		}
+
 		p := reflect.New(v.Type())
 		p.Elem().Set(v)
 		v = p
diff --git a/vendor/github.com/mitchellh/reflectwalk/reflectwalk.go b/vendor/github.com/mitchellh/reflectwalk/reflectwalk.go
index 3a6da9737..ec0a62337 100644
--- a/vendor/github.com/mitchellh/reflectwalk/reflectwalk.go
+++ b/vendor/github.com/mitchellh/reflectwalk/reflectwalk.go
@@ -4,7 +4,10 @@
 // those elements.
 package reflectwalk
 
-import "reflect"
+import (
+	"errors"
+	"reflect"
+)
 
 // PrimitiveWalker implementations are able to handle primitive values
 // within complex structures. Primitive values are numbers, strings,
@@ -16,6 +19,12 @@ type PrimitiveWalker interface {
 	Primitive(reflect.Value) error
 }
 
+// InterfaceWalker implementations are able to handle interface values as they
+// are encountered during the walk.
+type InterfaceWalker interface {
+	Interface(reflect.Value) error
+}
+
 // MapWalker implementations are able to handle individual elements
 // found within a map structure.
 type MapWalker interface {
@@ -53,6 +62,13 @@ type PointerWalker interface {
 	PointerExit(bool) error
 }
 
+// SkipEntry can be returned from walk functions to skip walking
+// the value of this field. This is only valid in the following functions:
+//
+//   - StructField: skips walking the struct value
+//
+var SkipEntry = errors.New("skip this entry")
+
 // Walk takes an arbitrary value and an interface and traverses the
 // value, calling callbacks on the interface if they are supported.
 // The interface should implement one or more of the walker interfaces
@@ -96,8 +112,15 @@ func walk(v reflect.Value, w interface{}) (err error) {
 
 	for {
 		if pointerV.Kind() == reflect.Interface {
+			if iw, ok := w.(InterfaceWalker); ok {
+				if err = iw.Interface(pointerV); err != nil {
+					return
+				}
+			}
+
 			pointerV = pointerV.Elem()
 		}
+
 		if pointerV.Kind() == reflect.Ptr {
 			pointer = true
 			v = reflect.Indirect(pointerV)
@@ -282,6 +305,12 @@ func walkStruct(v reflect.Value, w interface{}) (err error) {
 
 		if sw, ok := w.(StructWalker); ok {
 			err = sw.StructField(sf, f)
+
+			// SkipEntry just pretends this field doesn't even exist
+			if err == SkipEntry {
+				continue
+			}
+
 			if err != nil {
 				return
 			}
diff --git a/vendor/vendor.json b/vendor/vendor.json
index c5871e5c7..c54d87159 100644
--- a/vendor/vendor.json
+++ b/vendor/vendor.json
@@ -1464,10 +1464,10 @@
 			"revision": "8631ce90f28644f54aeedcb3e389a85174e067d1"
 		},
 		{
-			"checksumSHA1": "gsIaLhXE/YZahSg33edGHvzVQ1o=",
+			"checksumSHA1": "BsIMq23KDyxdhQC7g2dDz/9oHbA=",
 			"path": "github.com/mitchellh/copystructure",
-			"revision": "c740739b7b69de009385f52933769c1c037705df",
-			"revisionTime": "2016-10-03T06:35:14Z"
+			"revision": "c4815f984fb5c5486f6db1c9a5660e7605fd4c20",
+			"revisionTime": "2016-10-03T18:23:19Z"
 		},
 		{
 			"path": "github.com/mitchellh/go-homedir",
@@ -1499,10 +1499,10 @@
 			"revision": "6e6954073784f7ee67b28f2d22749d6479151ed7"
 		},
 		{
-			"checksumSHA1": "u+sHUhd/XXvjiVPAJ/h8yvLbSj4=",
+			"checksumSHA1": "vBpuqNfSTZcAR/0tP8tNYacySGs=",
 			"path": "github.com/mitchellh/reflectwalk",
-			"revision": "4a18c295388e8482403483c88469392f9e6556d7",
-			"revisionTime": "2016-10-02T04:32:56Z"
+			"revision": "92573fe8d000a145bfebc03a16bc22b34945867f",
+			"revisionTime": "2016-10-03T17:45:16Z"
 		},
 		{
 			"checksumSHA1": "/iig5lYSPCL3C8J7e4nTAevYNDE=",