[2/2] runtest: Let the test program handle the lack of a test name.

[Dylan Smith]

If no test name is specified in the test program, then it will either print
all the valid test names, or if it has only one test to run, then it will
run it.  This is much more helpful that runtest catching the missing test
name, since it doesn't print the test names, and doesn't allow the test name
to be missing when there is only a single test file.
---
 tools/runtest |    5 +----
 1 files changed, 1 insertions(+), 4 deletions(-)
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