Revert "Consume fake presence subscription (workaround for #104)"

This reverts commit 7eee39fca249743913d77cf75495a8bef9845e4e.

Signed-off-by: Daniele Ricci <daniele.athome@gmail.com>
Bounce error if presence subscription cannot be completed

Possibly connected to issue #104

Signed-off-by: Daniele Ricci <daniele.athome@gmail.com>