Make the error message checks locale proof

On a computer which has a locale set, the error messages look like this:

```
$ virsh net-info foo
erreur :impossible de récupérer le réseau « foo »
erreur :Réseau non trouvé : no network with matching name 'foo'
```
```
$ virsh pool-info foo
erreur :impossible de récupérer le pool « foo »
erreur :Pool de stockage introuvable : no storage pool with matching name 'foo'
```

The classical way to make those tests locale proof is to force a given locale.
Like this:
```
$ LANG=POSIX virsh net-info foo
error: failed to get network 'foo'
error: Réseau non trouvé : no network with matching name 'foo'
```
```
$ LANG=POSIX virsh pool-info foo
error: failed to get pool 'foo'
error: Pool de stockage introuvable : no storage pool with matching name 'foo'
```

It looks like the "Network not found" or "Storage pool not found" parts of the message
are generated by the `libvirtd` daemon and are not subject to the locale of the `virsh`
client.

The clean fix consists in patching `libvirt` so that `virsh` sends its locale to the
`libvirtd` daemon.
But in the mean time, it is safer to have our playbook match the part of the message
which is not subject to the daemon locale.

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