Resolve "Investigate GitLab-CI services don't reach each other"

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.

Related to #335

integration-tests/application_tests/application_test.go

@@ -12,6 +12,7 @@ import (
 	tpb "code.fbi.h-da.de/danet/gosdn/api/go/gosdn/transport"
 	"code.fbi.h-da.de/danet/gosdn/application-framework/event"
 	integration_test_utils "code.fbi.h-da.de/danet/gosdn/integration-tests/integrationTestUtils"
+	"github.com/sirupsen/logrus"
 
 	"google.golang.org/grpc"
 )
@@ -66,6 +67,8 @@ func TestMain(m *testing.M) {
 		rabbitMQAddress = envVarRabbitmq
 	}
 
+	logrus.Infof("RabbitMQ address: %s", rabbitMQAddress)
+
 	application = NewApplication(ctx, conn, ":55055", topics, rabbitMQAddress)
 
 	eventTypeCallbackTuples := []event.TypeToCallbackTuple{