systemc: Make the verify.py --list option print a total count.

Make the --list option of verify.py print a count of how many tests it
printed. Because --list respects the filter options, this is an easy
way to check how many tests have certain properties.

Change-Id: I03fac349a946631c20c8e6b49e0ad8934872898e
Reviewed-on: https://gem5-review.googlesource.com/11288
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Gabe Black <gabeblack@google.com>

src/systemc/tests/verify.py

@@ -216,6 +216,7 @@ with open(json_path) as f:
             print('%s.%s' % (target, main_args.flavor))
             for key, val in props.iteritems():
                 print('    %s: %s' % (key, val))
+        print('Total tests: %d' % len(filtered_tests))
     else:
         tests_to_run = list([
             Test(target, main_args.flavor, main_args.build_dir, props) for