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/role.go

@@ -23,10 +23,11 @@ type Role struct {
 	roleService rbacInterfaces.RoleService
 }
 
-// NewRoleServer receives a JWTManager and returns a new Role.
-func NewRoleServer(jwtManager *rbac.JWTManager) *Role {
+// NewRoleServer receives a JWTManager and a RoleService and returns a new RoleServer.
+func NewRoleServer(jwtManager *rbac.JWTManager, roleService rbacInterfaces.RoleService) *Role {
 	return &Role{
-		jwtManager: jwtManager,
+		jwtManager:  jwtManager,
+		roleService: roleService,
 	}
 }