Refactor duplicated SCons/Python test run code.

Refactor duplicated SCons/Python test run code.

Moved duplicated code test run code to a Python module under
tools/scons.  Support for Valgrind suppressions was also added.

Change-Id: I31d0bf7879116a358439e387dcd5fd87bbbecc9d
Signed-off-by: Ossama Othman <ossama.othman@intel.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/1678
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Jon A. Cruz <jonc@osg.samsung.com>
Reviewed-by: Caiwen Zhang <caiwen.zhang@intel.com>
Reviewed-by: Erich Keane <erich.keane@intel.com>