Adding Bootstrap Event

In preparation to the support of Bootstrap Container/Ephemeral Cluster
feature, the following updates have been added:

- Added Bootstrap event type, structure and method in event.go
- added processing of Bootstrap event in processor.go

Change-Id: Ic054f6b198648a4e1edcef71d8cfc0907bb775bc

pkg/events/events.go

@@ -37,6 +37,8 @@ const (
 	ClusterctlType
 	// IsogenType event emitted by Isogen executor
 	IsogenType
+	// BootstrapType event emitted by Bootstrap executor
+	BootstrapType
 )
 
 // Event holds all possible events that can be produced by airship
@@ -48,6 +50,7 @@ type Event struct {
 	StatusPollerEvent statuspollerevent.Event
 	ClusterctlEvent   ClusterctlEvent
 	IsogenEvent       IsogenEvent
+	BootstrapEvent    BootstrapEvent
 }
 
 // NewEvent create new event with timestamp
@@ -120,3 +123,32 @@ func (e Event) WithIsogenEvent(concreteEvent IsogenEvent) Event {
 	e.IsogenEvent = concreteEvent
 	return e
 }
+
+// BootstrapOperation type
+type BootstrapOperation int
+
+const (
+	// BootstrapStart operation
+	BootstrapStart BootstrapOperation = iota
+	// BootstrapDryRun operation
+	BootstrapDryRun
+	// BootstrapValidation operation
+	BootstrapValidation
+	// BootstrapRun operation
+	BootstrapRun
+	// BootstrapEnd operation
+	BootstrapEnd
+)
+
+// BootstrapEvent needs to to track events in bootstrap executor
+type BootstrapEvent struct {
+	Operation BootstrapOperation
+	Message   string
+}
+
+// WithBootstrapEvent sets type and actual bootstrap event
+func (e Event) WithBootstrapEvent(concreteEvent BootstrapEvent) Event {
+	e.Type = BootstrapType
+	e.BootstrapEvent = concreteEvent
+	return e
+}

pkg/events/processor.go

@@ -59,6 +59,8 @@ func (p *DefaultProcessor) Process(ch <-chan Event) error {
 			// Stringer interface or AsYAML for further processing.
 			// For now we print the event object as is
 			log.Printf("Received event: %v", e)
+		case BootstrapType:
+			log.Printf("%s", e.BootstrapEvent.Message)
 		case StatusPollerType:
 			log.Fatalf("Processing for status poller events are not yet implemented")
 		case WaitType: