Fix the tests for the ifconfig module

The code in the ifconfig module has been majorly refactored
due to the switch to a linux based appliance. This commit
fixies the broken test.
Also fix two broken tests that fail because they expect the
result to be in a specific order.

Change-Id: If3d476d417848a4cbc04b88a53893bb92335efde
Signed-off-by: Rosario Di Somma <rosario.disomma@dreamhost.com>
Why did we lose the tests that parse the flags and mtu?