Fix self-signed HTTPS example - install libssl-dev dependency.

Author: geerlingguy

https-self-signed/provisioning/main.yml

@@ -8,6 +8,9 @@
     - name: Ensure apt cache is updated.
       apt: update_cache=yes cache_valid_time=600
 
+    - name: Install dependency for pyopenssl.
+      apt: name=libssl-dev state=present
+
   roles:
     - geerlingguy.firewall
     - geerlingguy.pip