Some more debugging info

Signed-off-by: Daniele Ricci <daniele.athome@gmail.com>
Net: allow stanzas from other servers if host name is in keyring

This must be allowed because subscription notifications could be sent
from a remote resolver, thus generating a presence stanza possibly
originating from another server.
This should be considered a temporary patch though.

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