Changed the work with hooks in the part of tests.

Legacy approach:

```
g.before_all = function() ... end
g.after_all = function() ... end
```

The logic of executing hooks will be expected and
more controlled if use following approach:

```
g.before_all(function() ... end)
g.after_all(function() ... end)
```

Resolve #8066

NO_DOC=test fix
NO_TEST=test fix
NO_CHANGELOG=test fix