Add basic application framework and example application to show interaction between events an NBI

Depends on:

• !340 (merged)
• !344 (merged)
• !349 (merged)
• !342 (merged)

cli/cmd/userGet.go

@@ -33,6 +33,7 @@ package cmd
 
 import (
 	"code.fbi.h-da.de/danet/gosdn/controller/api"
+	"github.com/google/uuid"
 	log "github.com/sirupsen/logrus"
 	"github.com/spf13/cobra"
 	"github.com/spf13/viper"
@@ -45,7 +46,12 @@ var userGetCmd = &cobra.Command{
 	Long:  `Requests one user using the provided name to search for it in the stored users.`,
 
 	RunE: func(cmd *cobra.Command, args []string) error {
-		resp, err := api.GetUser(createContextWithAuthorization(), viper.GetString("controllerAPIEndpoint"), nbUserName)
+		resp, err := api.GetUser(
+			createContextWithAuthorization(),
+			viper.GetString("controllerAPIEndpoint"),
+			nbUserName,
+			uuid.Nil,
+		)
 		if err != nil {
 			return err
 		}