remove mapstructure from identity,networking,objectstorage,orchestration,pagination
diff --git a/openstack/networking/v2/extensions/provider/results.go b/openstack/networking/v2/extensions/provider/results.go
index 9590ae5..f437461 100755
--- a/openstack/networking/v2/extensions/provider/results.go
+++ b/openstack/networking/v2/extensions/provider/results.go
@@ -1,7 +1,6 @@
 package provider
 
 import (
-	"github.com/mitchellh/mapstructure"
 	"github.com/gophercloud/gophercloud/openstack/networking/v2/networks"
 	"github.com/gophercloud/gophercloud/pagination"
 )
@@ -22,30 +21,30 @@
 // NetworkExtAttrs represents an extended form of a Network with additional fields.
 type NetworkExtAttrs struct {
 	// UUID for the network
-	ID string `mapstructure:"id" json:"id"`
+	ID string `json:"id"`
 
 	// Human-readable name for the network. Might not be unique.
-	Name string `mapstructure:"name" json:"name"`
+	Name string `json:"name"`
 
 	// The administrative state of network. If false (down), the network does not forward packets.
-	AdminStateUp bool `mapstructure:"admin_state_up" json:"admin_state_up"`
+	AdminStateUp bool `json:"admin_state_up"`
 
 	// Indicates whether network is currently operational. Possible values include
 	// `ACTIVE', `DOWN', `BUILD', or `ERROR'. Plug-ins might define additional values.
-	Status string `mapstructure:"status" json:"status"`
+	Status string `json:"status"`
 
 	// Subnets associated with this network.
-	Subnets []string `mapstructure:"subnets" json:"subnets"`
+	Subnets []string `json:"subnets"`
 
 	// Owner of network. Only admin users can specify a tenant_id other than its own.
-	TenantID string `mapstructure:"tenant_id" json:"tenant_id"`
+	TenantID string `json:"tenant_id"`
 
 	// Specifies whether the network resource can be accessed by any tenant or not.
-	Shared bool `mapstructure:"shared" json:"shared"`
+	Shared bool `json:"shared"`
 
 	// Specifies the nature of the physical network mapped to this network
 	// resource. Examples are flat, vlan, or gre.
-	NetworkType string `json:"provider:network_type" mapstructure:"provider:network_type"`
+	NetworkType string `json:"provider:network_type"`
 
 	// Identifies the physical network on top of which this network object is
 	// being implemented. The OpenStack Networking API does not expose any facility
@@ -53,72 +52,53 @@
 	// the Open vSwitch plug-in this is a symbolic name which is then mapped to
 	// specific bridges on each compute host through the Open vSwitch plug-in
 	// configuration file.
-	PhysicalNetwork string `json:"provider:physical_network" mapstructure:"provider:physical_network"`
+	PhysicalNetwork string `json:"provider:physical_network"`
 
 	// Identifies an isolated segment on the physical network; the nature of the
 	// segment depends on the segmentation model defined by network_type. For
 	// instance, if network_type is vlan, then this is a vlan identifier;
 	// otherwise, if network_type is gre, then this will be a gre key.
-	SegmentationID string `json:"provider:segmentation_id" mapstructure:"provider:segmentation_id"`
+	SegmentationID string `json:"provider:segmentation_id"`
 }
 
 // ExtractGet decorates a GetResult struct returned from a networks.Get()
 // function with extended attributes.
 func ExtractGet(r networks.GetResult) (*NetworkExtAttrs, error) {
-	if r.Err != nil {
-		return nil, r.Err
-	}
-
-	var res struct {
+	var s struct {
 		Network *NetworkExtAttrs `json:"network"`
 	}
-
-	err := mapstructure.WeakDecode(r.Body, &res)
-
-	return res.Network, err
+	err := r.ExtractInto(&s)
+	return s.Network, err
 }
 
 // ExtractCreate decorates a CreateResult struct returned from a networks.Create()
 // function with extended attributes.
 func ExtractCreate(r networks.CreateResult) (*NetworkExtAttrs, error) {
-	if r.Err != nil {
-		return nil, r.Err
-	}
-
-	var res struct {
+	var s struct {
 		Network *NetworkExtAttrs `json:"network"`
 	}
-
-	err := mapstructure.WeakDecode(r.Body, &res)
-
-	return res.Network, err
+	err := r.ExtractInto(&s)
+	return s.Network, err
 }
 
 // ExtractUpdate decorates a UpdateResult struct returned from a
 // networks.Update() function with extended attributes.
 func ExtractUpdate(r networks.UpdateResult) (*NetworkExtAttrs, error) {
-	if r.Err != nil {
-		return nil, r.Err
-	}
-
-	var res struct {
+	var s struct {
 		Network *NetworkExtAttrs `json:"network"`
 	}
-
-	err := mapstructure.WeakDecode(r.Body, &res)
-
-	return res.Network, err
+	err := r.ExtractInto(&s)
+	return s.Network, err
 }
 
 // ExtractList accepts a Page struct, specifically a NetworkPage struct, and
 // extracts the elements into a slice of NetworkExtAttrs structs. In other
 // words, a generic collection is mapped into a relevant slice.
 func ExtractList(page pagination.Page) ([]NetworkExtAttrs, error) {
-	var resp struct {
-		Networks []NetworkExtAttrs `mapstructure:"networks" json:"networks"`
+	r := page.(networks.NetworkPage)
+	var s struct {
+		Networks []NetworkExtAttrs `json:"networks" json:"networks"`
 	}
-
-	err := mapstructure.WeakDecode(page.(networks.NetworkPage).Body, &resp)
-
-	return resp.Networks, err
+	err := r.ExtractInto(&s)
+	return s.Networks, err
 }