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Description of problem:

vdsm should filter out network devices that are not Ethernet, and their link speed is under 100Mbps. 
example for such case is as 'usb0' device, which, in certain configuration, can use for IP communication, however, its link speed is about 100Mbps, which is not recommended\supported by rhevm, and such, we should filter it out and not show it in rhevm GUI, network interfaces tab.

the risk here is that we don't do this right.
It's always easier for the user to ignore something (especially if we give them enough information) that it is for us to work on the correct logic to hide something.

http://git.engineering.redhat.com/?p=users/bazulay/vdsm.git;a=commitdiff;h=59fdf2f226c9c8a9353c2b86dd97081c8d3919da

tested on vdsm-4.9-47, vdsm dose filter usb and wlan interfaces.