minor fixes

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

util/fn/fn.go

@@ -0,0 +1,15 @@
+package fn
+
+type Initer interface {
+	Init(opts ...interface{}) error
+}
+
+func Init(ifaces ...Initer) error {
+	var err error
+	for _, iface := range ifaces {
+		if err = iface.Init(); err != nil {
+			return err
+		}
+	}
+	return nil
+}