setup datadog agent on each host.

- set agent version to 7

ansible-5/roles/datadog.datadog/handlers/main-win.yml

@@ -0,0 +1,11 @@
+---
+# This file doesn't actually contain "handlers" in the Ansible sense: when running
+# our role, Ansible only loads the contents of handlers/main.yml as handlers.
+# However, this is here because this is a "handler-like" task that is dynamically
+# included by a handler task in handlers/main.yml.
+- name: Restart Windows datadogagent service
+  win_service:
+    name: datadogagent
+    state: restarted
+    force_dependent_services: true
+  when: datadog_enabled and not ansible_check_mode and ansible_facts.os_family == "Windows"