make notification as separate package (#5294)

* Remove old notification files

* Add net package

* Add event package

* Modify minio to take new notification system

cmd/web-handlers.go

@@ -1,5 +1,5 @@
 /*
- * Minio Cloud Storage, (C) 2016, 2017 Minio, Inc.
+ * Minio Cloud Storage, (C) 2016, 2017, 2018 Minio, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -36,6 +36,7 @@ import (
 	"github.com/minio/minio/browser"
 	"github.com/minio/minio/pkg/auth"
 	"github.com/minio/minio/pkg/errors"
+	"github.com/minio/minio/pkg/event"
 	"github.com/minio/minio/pkg/hash"
 )
 
@@ -568,11 +569,11 @@ func (web *webAPIHandlers) Upload(w http.ResponseWriter, r *http.Request) {
 	}
 
 	// Notify object created event.
-	eventNotify(eventData{
-		Type:      ObjectCreatedPut,
-		Bucket:    bucket,
-		ObjInfo:   objInfo,
-		ReqParams: extractReqParams(r),
+	sendEvent(eventArgs{
+		EventName:  event.ObjectCreatedPut,
+		BucketName: bucket,
+		Object:     objInfo,
+		ReqParams:  extractReqParams(r),
 	})
 }