Test for status of nginx and return it to original state

Added a test for nginx status (service nginx status) which will
fail if nginx is not running. The success/failure of this probe
is used to trigger reload(success)/stop(fail) at the end of the
play, returning the service to it's original state.

playbooks/roles/lets_encrypt/tasks/main.yml

@@ -83,6 +83,24 @@
     - install
     - update
 
+# Store nginx running status to var
+# test for running later
+- name: check status of nginx
+  command: service nginx status
+  register: le_nginx_status
+  tags:
+    - install
+    - update
+  ignore_errors: True
+
+- name: start nginx if not running
+  service:
+    name: nginx
+    state: started
+  tags:
+    - install
+    - update
+
 - name: run certbot
   command: /tmp/run_certbot.sh
   tags:
@@ -135,10 +153,22 @@
     - install
     - install:cron
 
-- name: reload nginx config
+# Reload nginx if it was running (reload certificates)
+- name: reload nginx
   service:
     name: nginx
     state: reloaded
   tags:
     - install
     - update
+  when: le_nginx_status|success
+
+# Stop nginx if it was not running
+- name: stop nginx
+  service:
+    name: nginx
+    state: stopped
+  tags:
+   - install
+   - update
+  when: le_nginx_status|failed