Windows: Use the correct newline sequence for the platform (#21846)

This change to the template action plugin make template use the
platform's native newline_sequence for Jinja.

We also added the option `newline_sequence` to change the newline
sequence using by Jinja if you need to use another newline sequence than
the platform default.

This was previously discussed in
https://github.com/ansible/ansible/issues/16255#issuecomment-278289414

And also relates to issue #21128

lib/ansible/plugins/action/win_template.py

@@ -26,4 +26,4 @@ from ansible.plugins.action.template import ActionModule as TemplateActionModule
 # Even though TemplateActionModule inherits from ActionBase, we still need to
 # directly inherit from ActionBase to appease the plugin loader.
 class ActionModule(TemplateActionModule, ActionBase):
-    pass
+    DEFAULT_NEWLINE_SEQUENCE = '\r\n'