Ensure the same filtering for networks supported by vagrant-libvirt is
done for both driver and util by moving to call the same function with
filtering.
This avoids calls for the list of host devices from failing to parse
some networks that are not supported.
Fixes: #599
If the network does not have a bridge name, ignore it and move onto the
next one. This allows for hostdev networks to exist without breaking.
Includes some rudimentary testing to exercise the lookup code along with
a small bit of refactoring based on the realisation that there is no
need to lookup the network information twice as it is available if the
list_all_networks API is used.
Fixes: #599
Re-enable handling of the disk_device domain volume setting to ensure it
can be overridden from the default of vda to a value chosen.
Provide a disk resolver to resolve devices after the box has been downloaded
so that initial devices can be correctly allocated and avoid conflicts with
additional disks added that would otherwise get assigned the same device.
Removes hack for destroy domain when more than one disk, as now devices
in the config are only present if provided by the configuration.
Fixes: #1353
