Add testInterfaceProperties() . Move Ethernet verification out of testLoopback().

Add testInterfaceProperties(): verify if each interface can be retrieved
using getByName().  Use type properties of these interfaces to determine
if they are Ethernet.  Perform address tests on all active Ethernet interfaces.
Move Ethernet verification out of testLoopback into testInterfaceProperties.

Change-Id: I1641f2995f4ceb858eda38d1ba6137382b2c7ba3
Signed-off-by: Tochau Hoang <tochau.hoang@panasonic.aero>