tiny-test-fw: fix misc bugs:

1. configs are not functional
    * decorator will be executed when search case, need to set default config before search case.
2. fix DUT encode/decode errors
    * python3 serial don't support write string/unicode, need to convert to bytes first.
    * python2 string could failed to encode/decode non-acsii chars
3. fix bug that log folder not created
4. fix bug that test suite name is not correctly passed:
    * the keyward arg should be `test_suite_name` not `test_name`
5. fix bug that test stopped on failed case
6. fix DUT `read` don't return all data cache
    * `_DataCache.get_data` should first copy all data from queue to data cache and then return to user.
7. fix bug that `expect_all` failed even all expected item passed
8. optimize error info for expect
    * print pattern for regular expression when match failed
9. fix bug that set default config doesn't work

tools/tiny-test-fw/App.py

@@ -78,9 +78,12 @@ class BaseApp(object):
         if not test_suite_name:
             test_suite_name = os.path.splitext(os.path.basename(sys.modules['__main__'].__file__))[0]
         sdk_path = cls.get_sdk_path()
-        return os.path.join(sdk_path, "TEST_LOGS",
-                            test_suite_name +
-                            time.strftime("_%m%d_%H_%M_%S", time.localtime(LOG_FOLDER_TIMESTAMP)))
+        log_folder = os.path.join(sdk_path, "TEST_LOGS",
+                                  test_suite_name +
+                                  time.strftime("_%m%d_%H_%M_%S", time.localtime(LOG_FOLDER_TIMESTAMP)))
+        if not os.path.exists(log_folder):
+            os.makedirs(log_folder)
+        return log_folder
 
     def process_app_info(self):
         """