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box: allow to access to the granted role in _vuser space

Prior to this patch it was not possible for a user to see any role in
the `_vuser` space except the one created by him and the `public` one.

Let's also make it possible to see roles that he is granted with and
all the roles that role is granted transitively. Now calls to the
`box.schema.user.info()` functions won't fail if a user has a non-
'public' role granted.

Closes #10057

NO_DOC=bugfix

(cherry picked from commit 0280afce5)

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