[patch] Fix refcounting and locking in dbus-connection

[Havoc Pennington]

Hi,

I don't think close_internal is right - it doesn't make sense to call 
close() on a shared bus outside of its owner (libdbus), for either 
internal or external callers. Also, the bus daemon ideally uses only 
public API for the actual bus stuff, the internal API it uses is all the 
"utility" stuff.

I think the bus daemon should probably be using connection_open_private 
- well, for that matter does it open connections at all? I thought it 
only received connections. So they should not be shared, right?

The other changes looked OK on first glance though I did not review in 
detail, it would be good if someone else did.

Havoc