code clean of old code from network modules updates (#21469)

* removes unused code
* removes module_utils/local.py
* removes plugins/action/network.py
* removes action_handler from connection plugins
* removes code to use action_handler in task_executor
* updates action plugins to subclass from normal

lib/ansible/plugins/connection/__init__.py

@@ -67,7 +67,6 @@ class ConnectionBase(with_metaclass(ABCMeta, object)):
     # language means any language.
     module_implementation_preferences = ('',)
     allow_executable = True
-    action_handler = 'normal'
 
     def __init__(self, play_context, new_stdin, *args, **kwargs):
         # All these hasattrs allow subclasses to override these parameters