Correction of the registration from a difference.

Hi All,

Stonith-ng gets a wrong handling of notice of the difference from cib.
fencing_topology remains empty.
It is necessary to change a judgment.

```xml
<diff format="2" digest="f6d707001c848aeda0064a0e4b9ed639">
  <version>
    <source admin_epoch="0" epoch="2" num_updates="7"/>
    <target admin_epoch="0" epoch="3" num_updates="0"/>
  </version>
(snip)
  <change operation="create" path="/cib/configuration" position="4">
    <fencing-topology>
      <fencing-level target="srv01" devices="prmStonith2-1" index="1" id="fencing"/>
      <fencing-level target="srv01" devices="prmStonith2-2" index="2" id="fencing-0"/>
      <fencing-level target="srv02" devices="prmStonith1-1" index="1" id="fencing-1"/>
      <fencing-level target="srv02" devices="prmStonith1-2" index="2" id="fencing-2"/>
    </fencing-topology>
  </change>
(snip)
</diff>
```

Best Regards,
Hideo Yamauchi.