Migrate rackspace/gophercloud -> gophercloud/gophercloud

This change migrates the 'openstack' provider and 'keystone'
authenticator plugin to the newer gophercloud/gophercloud library.

Note the 'rackspace' provider still uses rackspace/gophercloud.

Fixes #30404

vendor/github.com/rackspace/gophercloud/openstack/identity/v3/extensions/trust/request.go

@@ -1,83 +0,0 @@
-package trust
-
-import (
-	"github.com/rackspace/gophercloud"
-	"github.com/rackspace/gophercloud/openstack"
-	token3 "github.com/rackspace/gophercloud/openstack/identity/v3/tokens"
-)
-
-type AuthOptionsExt struct {
-	token3.AuthOptions
-	TrustID string
-}
-
-func (ao AuthOptionsExt) ToAuthOptionsV3Map(c *gophercloud.ServiceClient, scope *token3.Scope) (map[string]interface{}, error) {
-	//Passing scope value to nil to add scope later in this function.
-	authMap, err := ao.AuthOptions.ToAuthOptionsV3Map(c, nil)
-	if err != nil {
-		return nil, err
-	}
-	authMap = authMap["auth"].(map[string]interface{})
-
-	// Add a "scope" element if a Scope has been provided.
-	if ao.TrustID != "" {
-		// TrustID provided.
-		authMap["scope"] = map[string]interface{}{
-			"OS-TRUST:trust": map[string]interface{}{
-				"id": ao.TrustID,
-			},
-		}
-	} else {
-		return nil, token3.ErrScopeEmpty
-	}
-	return map[string]interface{}{"auth": authMap}, nil
-}
-
-// AuthenticateV3 explicitly authenticates against the identity v3 service.
-func AuthenticateV3Trust(client *gophercloud.ProviderClient, options AuthOptionsExt) error {
-	return trustv3auth(client, "", options)
-}
-
-func trustv3auth(client *gophercloud.ProviderClient, endpoint string, options AuthOptionsExt) error {
-	//In case of Trust TokenId would be Provided so we have to populate the value in service client
-	//to not throw password error,also if it is not provided it will be empty which maintains
-	//the current implementation.
-	client.TokenID = options.AuthOptions.TokenID
-	// Override the generated service endpoint with the one returned by the version endpoint.
-	v3Client := openstack.NewIdentityV3(client)
-	if endpoint != "" {
-		v3Client.Endpoint = endpoint
-	}
-
-	// copy the auth options to a local variable that we can change. `options`
-	// needs to stay as-is for reauth purposes
-	v3Options := options
-
-	var scope *token3.Scope
-
-	result := token3.Create(v3Client, v3Options, scope)
-
-	token, err := result.ExtractToken()
-	if err != nil {
-		return err
-	}
-
-	catalog, err := result.ExtractServiceCatalog()
-	if err != nil {
-		return err
-	}
-
-	client.TokenID = token.ID
-
-	if options.AuthOptions.AllowReauth {
-		client.ReauthFunc = func() error {
-			client.TokenID = ""
-			return trustv3auth(client, endpoint, options)
-		}
-	}
-	client.EndpointLocator = func(opts gophercloud.EndpointOpts) (string, error) {
-		return openstack.V3EndpointURL(catalog, opts)
-	}
-
-	return nil
-}