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

Depends on:

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

controller/northbound/server/auth.go

@@ -24,10 +24,11 @@ type Auth struct {
 	userService rbacInterfaces.UserService
 }
 
-// NewAuthServer receives a JWTManager and returns a new Auth interface.
-func NewAuthServer(jwtManager *rbac.JWTManager) *Auth {
+// NewAuthServer receives a JWTManager and a userService and returns a new Auth interface.
+func NewAuthServer(jwtManager *rbac.JWTManager, userService rbacInterfaces.UserService) *Auth {
 	return &Auth{
-		jwtManager: jwtManager,
+		jwtManager:  jwtManager,
+		userService: userService,
 	}
 }