pr2-systemcheck / ec-diag. Detect and warn when links show packet loss. (ros ticket #4855)

[ahendrix]

Detect and warn when certain links have packet loss.

trac data:

• Owner: dking
• Reporter: dking
• Reported at: Wed Oct 27 15:31:21 2010
• URL: https://code.ros.org/trac/wg-ros-pkg/ticket/4855