add request for linode.config.update

lib/fog/linode/compute.rb

@@ -40,6 +40,7 @@ module Fog
       request :linode_config_list
       request :linode_config_create
       request :linode_config_delete
+      request :linode_config_update
       request :linode_create
       request :linode_delete
       request :linode_list

lib/fog/linode/requests/compute/linode_config_update.rb

@@ -0,0 +1,33 @@
+module Fog
+  module Compute
+    class Linode
+      class Real
+        # api docs say LinodeID is optional, turns out its required
+        def linode_config_update(linode_id, config_id, options={})
+          request(
+            :expects  => 200,
+            :method   => 'GET',
+            :query    => { 
+              :api_action => 'linode.config.update', 
+              :configId => config_id,
+              :linodeID => linode_id
+            }.merge!(options)
+          )
+        end
+      end
+
+      class Mock
+        def linode_config_update(linode_id, config_id, options={})
+          response = Excon::Response.new
+          response.status = 200
+          response.body = {
+            "ERRORARRAY" => [],
+            "ACTION"     => "linode.config.update",
+            "DATA"       => { "ConfigID" => rand(10000..99999) }
+          }
+          response
+        end
+      end
+    end
+  end
+end