tools: add addtional help to runtest

[Jeff Latimer]

Runtest was a bit confusing for me in that missed the significance of 
the input_file and could not get it to work.  This patch is a modest 
improvement.

Changelog: Add additional help to runtest to clarify the nature of the 
input_file

Jeff Latimer

---
  tools/runtest |    2 ++
  1 files changed, 2 insertions(+), 0 deletions(-)
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