add wait_for option to check for webserver uptime before haproxy enables

lamp_haproxy/rolling_update.yml

@@ -34,6 +34,9 @@
 
   # These tasks run after the roles:
   post_tasks:
+  - name: Wait for webserver to come up
+    wait_for: host={{ inventory_hostname }} port=80 state=started timeout=80s
+
   - name: Enable the server in haproxy
     shell: echo "enable server myapplb/{{ ansible_hostname }}" | socat stdio /var/lib/haproxy/stats
     delegate_to: "{{ item }}"