CI fixes

fix docstring for good, use comment style annotations where needed to support python<=3.4

Author: aabmass

opentelemetry-api/src/opentelemetry/configuration/__init__.py

@@ -99,16 +99,15 @@
 
 
 class Configuration:
-    _instance: Optional["Configuration"] = None
-    _config_map: Dict[str, ConfigValue]
+    _instance = None  # type: Optional["Configuration"]
+    _config_map = {}  # type: Dict[str, ConfigValue]
 
     def __new__(cls) -> "Configuration":
         if cls._instance is not None:
             instance = cls._instance
         else:
 
             instance = super().__new__(cls)
-            instance._config_map = {}
             for key, value_str in environ.items():
 
                 match = fullmatch(
@@ -150,7 +149,10 @@ def __setattr__(self, key: str, val: ConfigValue) -> None:
             raise AttributeError(key)
 
     def get(self, name: str, default: _T) -> _T:
-        """Use this typed method for dynamic access instead of `getattr`"""
+        """Use this typed method for dynamic access instead of `getattr`
+
+        :rtype: str or bool or int or float or None
+        """
         val = self._config_map.get(name, default)
         return val