snapshot: Fix tests/virsh-snapshot
snapshot: Fix tests/virsh-snapshot

Creating an 'exp' output file, but never comparing it against the
actual output, does not actually constitute testing the output. :)

Fixes: 280a2b41e
Signed-off-by: Eric Blake <a9da18479c871fe903d9590822cfe2629c6a4d11@redhat.com>

libvirt/libvirt,jardasgit/libvirt,jardasgit/libvirt,zippy2/libvirt,libvirt/libvirt,crobinso/libvirt,libvirt/libvirt,olafhering/libvirt,andreabolognani/libvirt,jardasgit/libvirt,fabianfreyer/libvirt,nertpinx/libvirt,andreabolognani/libvirt,nertpinx/libvirt,fabianfreyer/libvirt,zippy2/libvirt,olafhering/libvirt,zippy2/libvirt,libvirt/libvirt,jfehlig/libvirt,crobinso/libvirt,zippy2/libvirt,andreabolognani/libvirt,fabianfreyer/libvirt,crobinso/libvirt,olafhering/libvirt,crobinso/libvirt,olafhering/libvirt,jfehlig/libvirt,jardasgit/libvirt,nertpinx/libvirt,nertpinx/libvirt,fabianfreyer/libvirt,jfehlig/libvirt,andreabolognani/libvirt,jfehlig/libvirt,jardasgit/libvirt,fabianfreyer/libvirt,nertpinx/libvirt,andreabolognani/libvirt