Adjust timing of SMPI tests

Adjust timing of SMPI tests

For sure SMPI is the most impacted by the bandwidth factors changes.
It seems especially impacted when collective comms are involved.

The old version used 2 factors for SMPI comms:
1) network/bandwidth-factor was used to reduce the link capacity (e.g.
0.97*C for LV08)
2) smpi/bw-factor was used for each communication, limitating the flow
capacity.

Now, the code is simplified, each communication has only 1 bw-factor
that is applied after it's done, at the update remaining phase.
In most cases, only the bw-factor are applied now but after the comm is
done, not before