Resolve "Improve security by enabling and enforcing more linting rules"

Description

See #242 (closed)

controller/eventService/Service.go

 package eventservice
 
 import (
+	"context"
 	"encoding/json"
 
 	"code.fbi.h-da.de/danet/gosdn/controller/config"
@@ -61,7 +62,8 @@ func (e *EventService) PublishEvent(topic string, event event.Event) error {
 		return &errors.ErrCouldNotMarshall{Identifier: topic + " " + event.EntityID.String(), Type: event.Type, Err: err}
 	}
 
-	err = e.channel.Publish(
+	err = e.channel.PublishWithContext(
+		context.TODO(),
 		"",     // exchange
 		q.Name, // routing key
 		false,  // mandatory