Merge branch 'greg-throttling'

Add a tool to control Rx bandwidth throttling of the traffic that goes
from WR ports to Linux. It configures the FPGA module with a maximum allowed
bandwidth in KB/s. Throttling can be enabled to prevent Linux using 100% of
the processing power to receive Ethernet frames coming from WR ports to the
CPU.

Signed-off-by: Adam Wujek <adam.wujek@cern.ch>