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rcutorture: Summarize summary of build and run results
When running the default list of tests, the run summary of a successful
(that is, failed to find any errors) run fits easily on a 24-line screen.
But a run with something like "--configs '5*CFLIST'" will be 80 lines long,
and it is all too easy to miss a failure message when scrolling back.
This commit therefore prints out the number of runs with failing builds
or runtime failures, but only if there are any such failures.
For example, a run with a single build error and a single runtime error
would print two lines like this:
1 runs with build errors.
1 runs with runtime errors.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>