Add-scripts-ethernet

Hi,

These scripts are added to test ethernet automatically.
and modified dmesg-armadillo800eva.sh and proc-interrupts-armadillo800eva.sh
in order to confirm eth interface before test.These scripts are tested on
Armadillo800eva and Lager board. Please add these scripts into your tree.

Best Regards,
CAO MINH HIEP

Signed-off-by: Hiep Cao Minh <cm-hiep@jinso.co.jp>