lint: fix all major issues

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

service.go

@@ -88,6 +88,7 @@ func (s *service) Name() string {
 // Init initialises options. Additionally it calls cmd.Init
 // which parses command line flags. cmd.Init is only called
 // on first Init.
+//nolint:gocyclo
 func (s *service) Init(opts ...Option) error {
 	var err error
 	// process options
@@ -248,6 +249,7 @@ func (s *service) String() string {
 	return "micro"
 }
 
+//nolint:gocyclo
 func (s *service) Start() error {
 	var err error