update libkv godeps, fixes consul multiple IPs silently discarded

Signed-off-by: Alexandre Beslic <abronan@docker.com>

Godeps/Godeps.json

@@ -52,7 +52,7 @@
 		},
 		{
 			"ImportPath": "github.com/docker/libkv",
-			"Rev": "261ee167337a70a244e30410080685843b22e184"
+			"Rev": "56d6633db7a524c74773fd6b98f02afcd0e6f27a"
 		},
 		{
 			"ImportPath": "github.com/gogo/protobuf/proto",

Godeps/_workspace/src/github.com/docker/libkv/store/consul/consul.go

@@ -2,6 +2,7 @@ package consul
 
 import (
 	"crypto/tls"
+	"errors"
 	"net/http"
 	"strings"
 	"sync"
@@ -18,6 +19,12 @@ const (
 	DefaultWatchWaitTime = 15 * time.Second
 )
 
+var (
+	// ErrMultipleEndpointsUnsupported is thrown when there are
+	// multiple endpoints specified for Consul
+	ErrMultipleEndpointsUnsupported = errors.New("consul does not support multiple endpoints")
+)
+
 // Consul is the receiver type for the
 // Store interface
 type Consul struct {
@@ -34,6 +41,10 @@ type consulLock struct {
 // New creates a new Consul client given a list
 // of endpoints and optional tls config
 func New(endpoints []string, options *store.Config) (store.Store, error) {
+	if len(endpoints) > 1 {
+		return nil, ErrMultipleEndpointsUnsupported
+	}
+
 	s := &Consul{}
 
 	// Create Consul client

Godeps/_workspace/src/github.com/docker/libkv/store/etcd/etcd.go

@@ -122,7 +122,7 @@ func (s *Etcd) Get(key string) (pair *store.KVPair, err error) {
 	if err != nil {
 		if etcdError, ok := err.(*etcd.EtcdError); ok {
 			// Not a Directory or Not a file
-			if etcdError.ErrorCode == 102 || etcdError.ErrorCode == 104 {
+			if etcdError.ErrorCode == 100 || etcdError.ErrorCode == 102 || etcdError.ErrorCode == 104 {
 				return nil, store.ErrKeyNotFound
 			}
 		}