[libvirt] [PATCH 0/5] network: fix active status & usage of inactive networks

All 5 of these patches are required to address https://bugzilla.redhat.com/show_bug.cgi?id=880483 The reported problem is that an interface using a currently-inactive macvtap/hostdev network can be attached to a domain (addressed by 5/5). In order to make fixing that problem less of a problem, the automatic inactivation of all macvtap/hostdev networks any time libvirtd is restart must be addressed, and that is done in 1/5-4/5. Part of fixing the latter problem is changing the network driver to use /var/run for its status XML rather than /var/lib (2/5), which causes problems during upgrade (addressed in 3/5) and in a more limited sense downgrade (see the comments in 3/5 for why I haven't addressed those problems)