Preparation for packet mis-ordering stats

Preparation for packet mis-ordering stats

Changed PROX and the python scripts so that the "lat all stats" command
also returns the mis_ordered, extent and duplicate statistics.
In order to make this work properly, we need now to also stop and
restart the latency cores, every time we stop and start the generator
cores, since the sequence numbers are reinitialised every time we start
the generator core.

Change-Id: Ic4212a989c8ee9d0f026a34ca63a08b982c32b71
Signed-off-by: Luc Provoost <luc.provoost@intel.com>