Stat segment / client: show run" works now

Seems to have minimal-to-zero performance consequences. Data appears
accurate: result match the debug CLI output. Checked at low rates, 27
MPPS sprayed across two worker threads.

Change-Id: I09ede5150b88a91547feeee448a2854997613004
Signed-off-by: Dave Barach <dave@barachs.net>