Replace call to ethtool by ioctl

[xtor]

The code currently executes ethtool commands with the Ethtool class:

detd/detd/ethtool.py

Line 23 in 30aeb78

class CommandEthtool:

In some cases, this leads to problems when two commands are issues consecutively. A workaround is to sleep one second, like in:

detd/detd/devices/intel_i225.py

Line 67 in 30aeb78

def get_rate(self, interface):

This is not optimal, and introduces a delay of 1 second, that accounts for a big chunk of the execution time.

The code should use the SIOCETHTOOL to implement the ethtool operations instead. One suggested implementation could be:

• Create ioctl.py with Ioctl wrapper class
• Reimplement the required methods
• Replace the commands in SystemInformation, e.g. for get_rate replace

  detd/detd/systemconf.py

  Line 349 in 30aeb78

  def get_rate(self, interface):