resources: Officially add Validate method

This officially adds the Validate method to the resource API, and also
cleans up the ordering in existing resources.

resources/hostname.go

@@ -87,6 +87,14 @@ func (obj *HostnameRes) Default() Res {
 	return &HostnameRes{}
 }
 
+// Validate if the params passed in are valid data.
+func (obj *HostnameRes) Validate() error {
+	if obj.PrettyHostname == "" && obj.StaticHostname == "" && obj.TransientHostname == "" {
+		return ErrResourceInsufficientParameters
+	}
+	return nil
+}
+
 // Init runs some startup code for this resource.
 func (obj *HostnameRes) Init() error {
 	obj.BaseRes.kind = "Hostname"
@@ -102,15 +110,6 @@ func (obj *HostnameRes) Init() error {
 	return obj.BaseRes.Init() // call base init, b/c we're overriding
 }
 
-// Validate if the params passed in are valid data.
-// FIXME: where should this get called ?
-func (obj *HostnameRes) Validate() error {
-	if obj.PrettyHostname == "" && obj.StaticHostname == "" && obj.TransientHostname == "" {
-		return ErrResourceInsufficientParameters
-	}
-	return nil
-}
-
 // Watch is the primary listener for this resource and it outputs events.
 func (obj *HostnameRes) Watch(processChan chan event.Event) error {
 	cuid := obj.ConvergerUID() // get the converger uid used to report status