create ethernet functions test suite

[omnium21]

There is currently a basic ethernet test in automated/linux/ethernet that shows the IP address and pings the default router.

Linaro Member Services requires a more functional ethernet test.

Required functional tests:

• transfer a large amount of data over the network (eg. 1GB file) to another machine and make sure there is no data corruption (eg. md5sum matches at both ends)
  • and in reverse: from another machine to the DUT
• test that the data is passed without error
• generate test metrics for bandwidth / throughput
• test that the link doesn't train and no data is transferred when the cable is detached
• test that data transfer (eg. ping) fails when cable unplugged
• test link detection when cable plugged in
• use ping or fping to test with small and large packet sizes (default is 56, or 64 incl ICMP data)
  • eg. 1..15, 32768, 64501..65000

Run the functional tests in the following ethernet port configurations:

• speed 10/100/1000/auto
• full/half duplex
• alternative MTU sizes, eg 1508 (default=1500)