[libvirt] [PATCH 0/4] virNetworkUpdate bugfixes

The 4 patches here are in decreasing order of importance. The first: [PATCH 1/4] network: don't refresh iptables rules on networks prevents proper behavior with a valid request when modifying the interface pool list of a macvtap or hostdev network (because it tries to refresh non-existent iptables rules, fails, then aborts the update). The second: [PATCH 2/4] network: make virNetworkObjUpdate error detection/recovery better fixes two problems that would crop up when attempting an invalid update to a network. The third was pointed out by DV in his review of the dhcp-range and portgroup update backends: [PATCH 3/4] network: log error for unknown virNetworkUpdate command would allow a call to the virNetworkUpdate() API with an unknown command number to succeed (it wouldn't do anything, but might provide the illusion that it *had*). The fourth: [PATCH 4/4] network: backend for virNetworkUpdate of interface list is the last of the networkUpdate section backends that I was explicitly/specifically asked to implement.