Fix spurious reading network_name when using bridge as the source
Fix spurious reading network_name when using bridge as the source

In the past, Source contained Network and Bridge as a string.
Now because the Source is exclusive, it is an union of both.

There is no apparent reason why one would have a Network name as a source when
using Bridge as the source.

dmacvicar/terraform-provider-libvirt,dmacvicar/terraform-provider-libvirt,dmacvicar/terraform-provider-libvirt