GDaemonFileEnumerator: Only listen to messages one connection

There is no need to listen to messages on other connections than
the one we sent the request on. In fact, doing so is bad as it can cause
locking issues as per bug 708721.

https://bugzilla.gnome.org/show_bug.cgi?id=708744
GDaemonFileMonitor: Only recieve events on one dbus connection

There is no need to register for monitor evens on all dbus connections,
just the one we send the request on.

https://bugzilla.gnome.org/show_bug.cgi?id=708744
client: Remove unused code for dbus vfs filters

This code is not used anymore

https://bugzilla.gnome.org/show_bug.cgi?id=708744