test: add ethernet iperf example test case

tools/ci/python_packages/tiny_test_fw/EnvConfig.py

@@ -31,14 +31,8 @@ Config file format is yaml. it's a set of key-value pair. The following is an ex
 It will first define the env tag for each environment, then add its key-value pairs.
 This will prevent test cases from getting configs from other env when there're configs for multiple env in one file.
 """
-import logging
-
 import yaml
-
-try:
-    from yaml import CLoader as Loader
-except ImportError:
-    from yaml import Loader as Loader
+from yaml import Loader as Loader
 
 
 class Config(object):
@@ -59,11 +53,8 @@ class Config(object):
         try:
             with open(config_file) as f:
                 configs = yaml.load(f, Loader=Loader)[env_name]
-        except (OSError, TypeError, IOError):
+        except (OSError, TypeError, IOError, KeyError):
             configs = dict()
-        except KeyError:
-            logging.error('No config env "{}" in config file "{}"'.format(env_name, config_file))
-            raise
         return configs
 
     def get_variable(self, variable_name):