QoS: Increase queue size and quantum for fq_codel

QoS: Increase queue size and quantum for fq_codel

This optimises the QoS to process more bandwidth.

The limit variable sets the maximum number of packets in the
queue which was regularly exceeded on fast connections with
the old setting. This now allows up to 10G of data transfer
and is set to the default of fq_codel.

Quantum sets how many bytes can be read from the queue per
iteration. This is now set to the default again, which is
the size of an Ethernet frame including its header.

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>
Signed-off-by: Arne Fitzenreiter <arne_f@ipfire.org>