[validators] handle export validator case with pointer

[yalosev]

Signed-off-by: Yuriy Losev yuriy.losev@flant.com

Description

Export struct validator skips structs called like n := &Struct{} or n := new(Struct)

Why do we need it, and what problem does it solve?

We check FilterResult with unexported fields and such kind of declaration is out of the validator scope

Changelog entries

module: testing
type: fix
description: Fix export struct validator corner case