Merge branch 'tools-tc-testing-better-error-reporting'

Brenda J. Butler says:

====================
tools: tc-testing: better error reporting

This patch set contains a bit of cleanup and better error reporting,
esp. in pre- and post-suite, and pre- and post-case commands.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>