bugfix: Allow exact test names

bugfix: Allow exact test names

The current --tests option can make it hard to specify a single test to run.
This patch allows specification of tests using exact names.

JIRA: VSPERF-58

Signed-off-by: Billy O'Mahony<billy.o.mahony@intel.com>
Reviewed-by: Maryam Tahhan <maryam.tahhan@intel.com>
Reviewed-by: Martin Klozik <martinx.klozik@intel.com>
Reviewed-by: Radek Zetik <radekx.zetik@intel.com>
Reviewed-by: Dino Madarang <dino.simeonx.madarang@intel.com>
Reviewed-by: Brian Castelli <brian.castelli@spirent.com>
Change-Id: Ib820bdae96d6257d785f4e310a3b3d1fbfa1b575