Resources: Update interface to support errors

This was an early interface mistake I made and is now corrected.
We'll plumb in checking the error state of Init() and running Validate()
later on.

resources/resources.go

@@ -104,8 +104,8 @@ type Base interface {
 // Res is the minimum interface you need to implement to define a new resource.
 type Res interface {
 	Base // include everything from the Base interface
-	Init()
-	//Validate() bool    // TODO: this might one day be added
+	Init() error
+	//Validate() error    // TODO: this might one day be added
 	GetUUIDs() []ResUUID          // most resources only return one
 	Watch(chan event.Event) error // send on channel to signal process() events
 	CheckApply(bool) (bool, error)
@@ -170,8 +170,9 @@ func (obj *BaseUUID) Reversed() bool {
 }
 
 // Init initializes structures like channels if created without New constructor.
-func (obj *BaseRes) Init() {
+func (obj *BaseRes) Init() error {
 	obj.events = make(chan event.Event) // unbuffered chan size to avoid stale events
+	return nil
 }
 
 // GetName is used by all the resources to Get the name.