qemu: Add enough USB hubs to accomodate all devices
Commit 815d98ac started auto-adding one hub if there are more USB devices than available USB ports. This was a strange choice, since there might be even more devices. Before USB address allocation was implemented in libvirt, QEMU automatically added a new USB hub if the old one was full. Adjust the logic to try adding as many hubs as will be needed to plug in all the specified devices. https://bugzilla.redhat.com/show_bug.cgi?id=1410188
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