roles/apache: Role to deploy Apache HTTPD

The *apache* role installs and configures the Apache HTTPD server and
its *mod_ssl* module. It currently only works on Fedora/RHEL-based
distributions.

roles/apache/templates/servername.httpd.conf.j2

@@ -0,0 +1,12 @@
+#
+# ServerName gives the name and port that the server uses to identify itself.
+# This can often be determined automatically, but we recommend you specify
+# it explicitly to prevent problems during startup.
+#
+# If your host doesn't have a registered DNS name, enter its IP address here.
+#
+{% if apache_server_name is defined %}
+ServerName {{ apache_server_name }}
+{% else %}
+#ServerName www.example.com:80
+{% endif %}