lxc-clone: update any hwaddrs
lxc-clone: update any hwaddrs

Since we are creating a new container it should not share a macaddr with
the original container.

Bug-Ubuntu: https://bugs.launchpad.net/ubuntu/+source/lxc/+bug/934256

Signed-off-by: Serge Hallyn <3df611b026e4639bee8aef7a4beb2e39fcebb313@ubuntu.com>
Signed-off-by: Daniel Lezcano <3211518dd4d87cb3f7ee12cb52e14b7fb2bc0446@fr.ibm.com>

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