ss: Add timestamp parameter to debugPrint for intervals

ss: Add timestamp parameter to debugPrint for intervals

Printing the intervals is useful for debugging, but for large history trees,
it can get very big. Printing only nodes intersecting a given time range may
be more realistic, for instance to debug an incoherent interval storage when
querying at time t.

Change-Id: I0d71725c6cbe3bd3ad8abf9e9b5d7588aefc094f
Signed-off-by: Geneviève Bastien <gbastien+lttng@versatic.net>
Reviewed-on: https://git.eclipse.org/r/70886
Reviewed-by: Hudson CI
Reviewed-by: Alexandre Montplaisir <alexmonthy@efficios.com>
Tested-by: Alexandre Montplaisir <alexmonthy@efficios.com>