Add two MAC addresses support for Mihawk's 2 NICs

In somes systms, there are 2 MAC addresses for 2 NICs like mihawk. In
order to support system like Mihawk, check the object path of
NetworkInterface to find the corresponding object of NIC.

Tested: Get the 2 MAC addresses of eth0 and eth1 from inventory

Signed-off-by: Alvin Wang <alvinwang@msn.com>
Change-Id: I2ee08c020010bccd7e46b94d69f5fd80a639aef7
3 files changed