d/gestioip: fix deploy of /etc/gestioip/ip_priv

The link between /etc/gestioip/ip_priv and /usr/share/gestioip/priv/ip_config
was bad done.

This commit fixes the link and avoid the lintian warning regarding the
perms of the file.

However, this still needs further work.

Signed-off-by: Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>