402298: Improve Scout RT tests.
Added template test for service tunnel input validation strategies.

Change-Id: Icdc20a98b1243449ccb5dc20a70b5e5e4aac880d
Task-Url: https://bugs.eclipse.org/bugs/show_bug.cgi?id=402298
Signed-off-by: Ralph Steiner <rst@bsiag.com>
Reviewed-on: https://git.eclipse.org/r/37641
Tested-by: Hudson CI
Reviewed-by: Judith Gull <jgu@bsiag.com>