Set the seed when randMacAddr
Set the seed when randMacAddr

If the seed was not seted, all machines get the same MAC address.
Then technique like Open vSwitch won't work due to the same MAC address
of all machines.

Signed-off-by: Shiao-An Yuan <c0ce52d404502cdd041b56c7fd582a4e6543606b@gmail.com>

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