unit-tests: Pass a test suite collection name to print during test execution

As we except to get more and more test runners for the different components,
we add a name to easily identify them on the test output.

src/libstrongswan/tests/tests.c

@@ -52,5 +52,5 @@ static bool test_runner_init(bool init)
 
 int main(int argc, char *argv[])
 {
-	return test_runner_run(tests, test_runner_init);
+	return test_runner_run("libstrongswan", tests, test_runner_init);
 }