Use config package to handle all controller configurations

Description

Related Issue

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

initialise_test.go

@@ -4,6 +4,8 @@ import (
 	"os"
 	"testing"
 
+	"code.fbi.h-da.de/danet/gosdn/config"
+
 	"github.com/google/uuid"
 	log "github.com/sirupsen/logrus"
 )
@@ -17,10 +19,8 @@ var cuid uuid.UUID
 
 func TestMain(m *testing.M) {
 	log.SetReportCaller(true)
+	log.SetLevel(config.LogLevel)
 
-	if os.Getenv("GOSDN_LOG") == "nolog" {
-		log.SetLevel(log.PanicLevel)
-	}
 	readTestUUIDs()
 	os.Exit(m.Run())
 }