iozone: Rewrite parse_metrics() function

When users specify tests, the parse_metrics()
function doesn't capture the last report name and its
results during the parsing process. Fix the
parse_metrics() function to make sure the data for
all reports are captured.

Signed-off-by: Lisa Nguyen <lisa.nguyen@linaro.org>

wlauto/workloads/iozone/__init__.py

@@ -240,6 +240,9 @@ class Iozone(Workload):
                 value_list.append(subvalue_list)
                 subvalue_list = []
 
+        if subvalue_list:
+            value_list.append(subvalue_list)
+
         for reports in value_list:
             # grab report name and convert it to a string
             report_name = reports[0]