pass diff and verbosity settings to modules

also simplifies and guarantees that all flags are always passed, even when false
this should make checks simpler as you always expect them to exist

lib/ansible/plugins/action/__init__.py

@@ -371,18 +371,24 @@ class ActionBase(with_metaclass(ABCMeta, object)):
             module_args = self._task.args
 
         # set check mode in the module arguments, if required
-        if self._play_context.check_mode and not self._task.always_run:
+        if self._play_context.check_mode:
             if not self._supports_check_mode:
                 raise AnsibleError("check mode is not supported for this operation")
             module_args['_ansible_check_mode'] = True
+        else:
+            module_args['_ansible_check_mode'] = False
 
         # set no log in the module arguments, if required
-        if self._play_context.no_log or C.DEFAULT_NO_TARGET_SYSLOG:
-            module_args['_ansible_no_log'] = True
+        module_args['_ansible_no_log'] = self._play_context.no_log or C.DEFAULT_NO_TARGET_SYSLOG
 
         # set debug in the module arguments, if required
-        if C.DEFAULT_DEBUG:
-            module_args['_ansible_debug'] = True
+        module_args['_ansible_debug'] = C.DEFAULT_DEBUG
+
+        # let module know we are in diff mode
+        module_args['_ansible_diff'] = self._play_context.diff
+
+        # let module know our verbosity
+        module_args['_ansible_verbosity'] = self._display.verbosity
 
         (module_style, shebang, module_data) = self._configure_module(module_name=module_name, module_args=module_args, task_vars=task_vars)
         if not shebang: