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[libvirt] CPU topology 'sockets' handling guest vs host

On my x86_64 host I have a pair of Quad core CPUs, each in a separate
NUMA node. The virsh capabilities
topology data reports this:

  # virsh capabilities | xmllint  --xpath /capabilities/host/cpu -
      <topology sockets="1" cores="4" threads="1"/>
      <feature name="osvw"/>
      <feature name="3dnowprefetch"/>
      <feature name="cr8legacy"/>
      <feature name="extapic"/>
      <feature name="cmp_legacy"/>
      <feature name="3dnow"/>
      <feature name="3dnowext"/>
      <feature name="pdpe1gb"/>
      <feature name="fxsr_opt"/>
      <feature name="mmxext"/>
      <feature name="ht"/>
      <feature name="vme"/>
  # virsh capabilities | xmllint  --xpath /capabilities/host/topology -
      <cells num="2">
        <cell id="0">
          <cpus num="4">
            <cpu id="0"/>
            <cpu id="1"/>
            <cpu id="2"/>
            <cpu id="3"/>
        <cell id="1">
          <cpus num="4">
            <cpu id="4"/>
            <cpu id="5"/>
            <cpu id="6"/>
            <cpu id="7"/>

Note, it is reporting sockets=1, because sockets is the number of sockets
*per* NUMA node.

Now I try to figure the guest to match the host using:

    <topology sockets='1' cores='4' threads='1'/>
      <cell cpus='0-3' memory='512000'/>
      <cell cpus='4-7' memory='512000'/>

And I get:

  error: Maximum CPUs greater than topology limit

So, the XML checker is mistaking 'sockets' as the total number of sockets,
rather than the per-node socket count. We need to fix this bogus check

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