Factor qemuBuildHostNetStr() out from qemuBuildCommandLine()
Factor qemuBuildHostNetStr() out from qemuBuildCommandLine()

Re-factor this code so that it can be used for NIC hotplug
too. The awkward prefix and type_sep arguments are needed to
allow us to do "host_net_add tap vlan=..."

* src/qemu_conf.c: factor the net backend string formatting
  code into its own function

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