Revert "keep ansible_local as top level var, always present"

This reverts commit 97cb2016d8.

It was causing issues downstream as facts seem to be merged back for
subsequent tasks. Will restore if I ever figure out how to avoid that.

lib/ansible/vars/__init__.py

@@ -289,17 +289,6 @@ class VariableManager:
                     all_vars = combine_vars(all_vars, host_facts)
                 # always return namespaced facts
                 all_vars = combine_vars(all_vars, {'ansible_facts': host_facts})
-
-                # push local to top namespace, ensure we always have, even if empty
-                if 'ansible_local' in all_vars['ansible_facts']:
-                    all_vars.update({'ansible_local': all_vars['ansible_facts']['ansible_local']})
-                else:
-                    all_vars.update({'ansible_local': {}})
-
-                # remove possible extra ansible_local from ansible_facts namespace
-                if 'ansible_local' in all_vars['ansible_facts']:
-                    del all_vars['ansible_facts']['ansible_local']
-
             except KeyError:
                 pass