Fix sample 2.11 configuration
Fix sample 2.11 configuration

In 2.11, children disks have UUIDs, too.

Signed-off-by: Klaus Aehlig <4ce51de36d9068cd7db2eec1151e0f3f95419008@google.com>
Reviewed-by: Hrvoje Ribicic <be5828fca31f89218048bec4189e30a581aa65da@google.com>

yiannist/ganeti,onponomarev/ganeti,ganeti/ganeti,leshchevds/ganeti,bitemyapp/ganeti,leshchevds/ganeti,leshchevds/ganeti,onponomarev/ganeti,mbakke/ganeti,andir/ganeti,yiannist/ganeti,andir/ganeti,mbakke/ganeti,andir/ganeti,grnet/snf-ganeti,bitemyapp/ganeti,ganeti/ganeti,mbakke/ganeti,ganeti/ganeti,grnet/snf-ganeti,yiannist/ganeti