Add gophercloud openstack/networking/v2/extensions

Aka github.com/rackspace/gophercloud/openstack/networking/v2/extensions

vendor/github.com/rackspace/gophercloud/openstack/common/extensions/requests.go

@@ -0,0 +1,21 @@
+package extensions
+
+import (
+	"github.com/rackspace/gophercloud"
+	"github.com/rackspace/gophercloud/pagination"
+)
+
+// Get retrieves information for a specific extension using its alias.
+func Get(c *gophercloud.ServiceClient, alias string) GetResult {
+	var res GetResult
+	_, res.Err = c.Get(ExtensionURL(c, alias), &res.Body, nil)
+	return res
+}
+
+// List returns a Pager which allows you to iterate over the full collection of extensions.
+// It does not accept query parameters.
+func List(c *gophercloud.ServiceClient) pagination.Pager {
+	return pagination.NewPager(c, ListExtensionURL(c), func(r pagination.PageResult) pagination.Page {
+		return ExtensionPage{pagination.SinglePageBase(r)}
+	})
+}