itest: adjust code according to linters

Author: ViktorT-11

itest/hashmailserver_harness.go

@@ -20,6 +20,8 @@ type HashmailHarness struct {
 }
 
 // NewHashmailHarness creates a new instance of the HashmailHarness.
+//
+//nolint:exhaustruct
 func NewHashmailHarness() *HashmailHarness {
 	return &HashmailHarness{
 		ApertureCfg: &aperture.Config{

itest/test_harness.go

@@ -60,11 +60,14 @@ func newHarnessTest(t *testing.T, cfg *testConfig) *harnessTest {
 
 	mailboxAddr := testnetMailbox
 	var insecure bool
+
 	if !cfg.stagingMailbox {
 		ht.hmserver = NewHashmailHarness()
+
 		if err := ht.hmserver.Start(); err != nil {
 			t.Fatalf("could not start hashmail server: %v", err)
 		}
+
 		mailboxAddr = ht.hmserver.ApertureCfg.ListenAddr
 		insecure = true
 	}