PPI: Fix cloneSource unit-test packet construction
Scheduler: BUGFIX: uninitialized loop variable
Scheduler: BUGFIX: delay deletions in fdTable_ (can't change map while iterating over it)
Add global 'valgrind' target
Add 'valgrind.sup' suppressions file to suppress custom benign valgrind errors
Fix all unit-tests to run correcly under valgrind (mostly timing adjustments)