Update gophercloud vendor dependency to v0.1.0

vendor/github.com/gophercloud/gophercloud/auth_result.go

@@ -0,0 +1,52 @@
+package gophercloud
+
+/*
+AuthResult is the result from the request that was used to obtain a provider
+client's Keystone token. It is returned from ProviderClient.GetAuthResult().
+
+The following types satisfy this interface:
+
+	github.com/gophercloud/gophercloud/openstack/identity/v2/tokens.CreateResult
+	github.com/gophercloud/gophercloud/openstack/identity/v3/tokens.CreateResult
+
+Usage example:
+
+	import (
+		"github.com/gophercloud/gophercloud"
+		tokens2 "github.com/gophercloud/gophercloud/openstack/identity/v2/tokens"
+		tokens3 "github.com/gophercloud/gophercloud/openstack/identity/v3/tokens"
+	)
+
+	func GetAuthenticatedUserID(providerClient *gophercloud.ProviderClient) (string, error) {
+		r := providerClient.GetAuthResult()
+		if r == nil {
+			//ProviderClient did not use openstack.Authenticate(), e.g. because token
+			//was set manually with ProviderClient.SetToken()
+			return "", errors.New("no AuthResult available")
+		}
+		switch r := r.(type) {
+		case tokens2.CreateResult:
+			u, err := r.ExtractUser()
+			if err != nil {
+				return "", err
+			}
+			return u.ID, nil
+		case tokens3.CreateResult:
+			u, err := r.ExtractUser()
+			if err != nil {
+				return "", err
+			}
+			return u.ID, nil
+		default:
+			panic(fmt.Sprintf("got unexpected AuthResult type %t", r))
+		}
+	}
+
+Both implementing types share a lot of methods by name, like ExtractUser() in
+this example. But those methods cannot be part of the AuthResult interface
+because the return types are different (in this case, type tokens2.User vs.
+type tokens3.User).
+*/
+type AuthResult interface {
+	ExtractTokenID() (string, error)
+}