lxc-clone: change uuid on xfs
lxc-clone: change uuid on xfs

Otherwise after cloning an lvm+xfs container you can't run the
original and clone at the same time.

Based on a patch by Maurizio Sambati posted at
https://bugs.launchpad.net/ubuntu/+source/lxc/+bug/1013549

Signed-off-by: Serge Hallyn <3df611b026e4639bee8aef7a4beb2e39fcebb313@ubuntu.com>

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