releng: Add additional arguments to the command line

releng: Add additional arguments to the command line

This will allow for instance to add arguments to enable logging for a
custom test suite

Change-Id: I149ee22e8d4843f596d45e476021b8ad0fba0008
Signed-off-by: Geneviève Bastien <gbastien+lttng@versatic.net>
Reviewed-on: https://git.eclipse.org/r/91811
Reviewed-by: Hudson CI
Reviewed-by: Marc-André Laperle <marc-andre.laperle@ericsson.com>
Tested-by: Marc-André Laperle <marc-andre.laperle@ericsson.com>