Various fixes to URL paths
diff --git a/openstack/identity/v2/extensions/admin/roles/urls.go b/openstack/identity/v2/extensions/admin/roles/urls.go
index 170658d..61b3155 100644
--- a/openstack/identity/v2/extensions/admin/roles/urls.go
+++ b/openstack/identity/v2/extensions/admin/roles/urls.go
@@ -3,18 +3,19 @@
 import "github.com/rackspace/gophercloud"
 
 const (
-	ExtPath  = "OS-KSADMN/roles"
+	ExtPath  = "OS-KSADM"
+	RolePath = "roles"
 	UserPath = "users"
 )
 
 func resourceURL(c *gophercloud.ServiceClient, id string) string {
-	return c.ServiceURL(ExtPath, id)
+	return c.ServiceURL(ExtPath, RolePath, id)
 }
 
 func rootURL(c *gophercloud.ServiceClient) string {
-	return c.ServiceURL(ExtPath)
+	return c.ServiceURL(ExtPath, RolePath)
 }
 
 func userRoleURL(c *gophercloud.ServiceClient, tenantID, userID, roleID string) string {
-	return c.ServiceURL("tenants", tenantID, UserPath, userID, ExtPath, roleID)
+	return c.ServiceURL("tenants", tenantID, UserPath, userID, RolePath, ExtPath, roleID)
 }