Hi Daniel,

I resent my patch. I hope to fix folding failure.

This patch allows users to specify the MTU size of the veth interface.
 It helps to use jumbo frames on the container.

Changes from v1:
	- Fix failing if the 'mtu' is not specified.
	- Delete the 'mtu' entry at time of lxc-destroy.
Signed-off-by: Ryousei Takano <takano-ryousei@aist.go.jp>
Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>