feat(profiles): Do not repeat seeds in 6p profiles

feat(profiles): Do not repeat seeds in 6p profiles

On one hand, using seed==1 for all W-E streams
and seed=2 for all E-W streams would make 6p tests
even more comparable with 2p tests.
But current rnd profiles were mixing the two seed values.

On the other hand, using unique seed values for each stream
would ensure VPP is less likely to deviate from average preformance.
As the second approach also results in smaller profile files,
this patch applies that approach.

Change-Id: If0f57282a2899a1a4fb154dd6ed810064cb5c212
Signed-off-by: Vratko Polak <vrpolak@cisco.com>