BUG #7818: Foreign server not visible under normal users

The following bug has been logged on the website:

Bug reference:      7818
Logged by:          Alberto Brosich
Email address:      abrosich@ogs.trieste.it
PostgreSQL version: 9.2.2
Operating system:   Debian GNU/Linux 7.0
Description:        =


I installed oracle_fdw (version 0.9.8).
Under "postgres" user works all fine and I can create tables and select from
them.
Despite the fact that I granted usage to a normal user (as specified in the
documentation, with the command "GRANT USAGE ON FOREIGN SERVER server TO
pguser;")
, that user cannot see the server: \des gives an empty list and every
command about foreign server gives an error (for example CREATE USER
MAPPING...).
Postgresql is installed from PGDG apt repository.