De-duplicate unidirection support

De-duplicate unidirection support

- Latency is now reported in both directions.
-- For unidirection that means additional -1/-1/-1.
+ Changed function argument wrapping to save vertical space.
+ Changed trex command synthesys to save vertical space.
+ Fixed handling of command line arguments to avoid superfluous spaces.
+ More care distinguishing (0, 1) from (port_0, port_1).
- Not renaming the original port arguments.

Change-Id: I7b1736b594f6edea52eb07e5bc76ef52d0af92f8
Signed-off-by: Vratko Polak <vrpolak@cisco.com>