Resolve "Refactor how PNDs are implemented in the code"

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.

Closes #243

controller/api/initialise_test.go

@@ -26,7 +26,6 @@ import (
 	"code.fbi.h-da.de/danet/gosdn/controller/nucleus"
 	"code.fbi.h-da.de/danet/gosdn/controller/nucleus/util/proto"
 	rbacImpl "code.fbi.h-da.de/danet/gosdn/controller/rbac"
-	"code.fbi.h-da.de/danet/gosdn/controller/servmgmt"
 	"code.fbi.h-da.de/danet/gosdn/controller/topology"
 	"code.fbi.h-da.de/danet/gosdn/controller/topology/links"
 	"code.fbi.h-da.de/danet/gosdn/controller/topology/nodes"
@@ -191,10 +190,13 @@ func bootstrapUnitTest() {
 	}, sbi, conflict.Metadata{ResourceVersion: 0})
 	_ = networkElementService.Add(mne)
 
-	serviceManager := servmgmt.ServiceManager{MneService: networkElementService, SbiService: sbiService, PNDStore: pndStore}
+	pndService := &mocks.PndService{}
 
 	northbound := nbi.NewNBI(
 		pndStore,
+		pndService,
+		networkElementService,
+		sbiService,
 		userService,
 		roleService,
 		*jwtManager,
@@ -204,7 +206,6 @@ func bootstrapUnitTest() {
 		routeService,
 		appService,
 		&mockPnd,
-		serviceManager,
 	)
 
 	cpb.RegisterCoreServiceServer(s, northbound.Core)