network: don't allow multiple default portgroups
This resolves: https://bugzilla.redhat.com/show_bug.cgi?id=868483 virNetworkUpdate, virNetworkDefine, and virNetworkCreate all three allow network definitions to contain multiple <portgroup> elements with default='yes'. Only a single default portgroup should be allowed for each network. This patch updates networkValidate() (called by both virNetworkCreate() and virNetworkDefine()) and virNetworkDefUpdatePortGroup (called by virNetworkUpdate() to not allow multiple default portgroups. (cherry picked from commit 6f8a8b30)
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