Add summary lines of test cases and return an error
code if any test case fails so that tester don't have
to monitor the output.

Link: https://lkml.kernel.org/r/158898590533.22749.10269622752797822320.stgit@devnote2Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>