[packagekit] Not doing updates when on GPRS

[Richard Hughes]

I want to make PackageKit not do updates when I'm on my GRPS connection
- for this we need to know:

1. If the connection is up
2. The type of connection
3. The throughput of the connection

And we need a metric to sum this up as a:

[X] Don't update when on slow connections
or
[X] Don't update when on dial up connections

I guess we can use libnm_glib for this, as we already get the
connection "up/down" status like that. Other ideas welcome.

Richard.