packagekit error seems to cause mgmt to get stuck

Some error response from packagekit causes mgmt to get stuck, I think? This particular use cases relies on `--converged-timeout 10`, so my expectation is that it exits shortly after *or* retries having not satisfied the pkg[] resource bits. ``` 00:53:16 engine: pkg[qemu-guest-agent]: Apply: pkg[autogroup:(qemu-guest-agent,ptyxis,openssh-server,gnome,gdm3,accountsservice)] 00:53:16 engine: pkg[qemu-guest-agent]: Set(installed): pkg[autogroup:(qemu-guest-agent,accountsservice,gdm3,gnome,openssh-server,ptyxis)]... 00:53:16 engine: pkg[qemu-guest-agent]: Error: error during Process(): can't refresh cache: packagekit error 2: Cannot refresh cache whilst offline <and then all that remains is an endless void of waiting> ``` I waited a few minutes before interrupting mgmt. This error, to me, indicates something wrong with packagekit[1]. However, I don't think mgmt should get stuck. I can't say I know what the correct behavior is, though, maybe aborting the pkg step and trying again? [1] Why does packagekit think it is offline? I dunnno. Modern linux is fascinatingly complex in perhaps unnecessary ways. The machine is, in fact, not "offline" so I don't know what this means. I'll do separate packagekit reserach outside the scope of this isue to try and figure out why packagekit is being foolish.