Improve how the (P|T)IDs are printed.

Since we often end up saturating the system with marco/polo threads,
the parent that forks off all the bouncers have normal priority.

When it comes to listing the IDs, it won't receive time on the CPU
until all marco's and polo's have finished running, rendering the
whole --pid option rather useless.

Signed-off-by: Henrik Austad <haustad@cisco.com>