driver/rados: treat OMAP EIO as a PathNotFoundError
driver/rados: treat OMAP EIO as a PathNotFoundError

RADOS returns a -EIO when trying to read a non-existing OMAP, treat it as a
PathNotFoundError when trying to list a non existing virtual directory.

Signed-off-by: Vincent Giersch <87e1f221a672a14a323e57bb65eaea19d3ed3804@giersch.fr>

thaJeztah/distribution,thaJeztah/distribution