Set classes of traffic in high_throughput_limits

This patch creates 2 classes for the bandwidth limited test instead of
one. The intent is to have multiple queues in the kernel instead of just
one. That way we can prioritize the control port over the data port and
make sure it gets its share of the bandwidth.

With this update, the control port gets 1/10th of the limit and the data
get the remaining 9/10th. If unused, the data connection can borrow the
remaining bandwidth.

Signed-off-by: Julien Desfossez <jdesfossez@efficios.com>
Signed-off-by: David Goulet <dgoulet@efficios.com>