roles/nginx: Add role for nginx

This role installs nginx and provides a base/skeleton configuration
suitable for most deployments.

roles/nginx/defaults/main.yml

@@ -0,0 +1,7 @@
+nginx_ssl_certificate: /etc/pki/nginx/server.crt
+nginx_ssl_certificate_key: /etc/pki/nginx/private/server.key
+nginx_ssl_session_cache: shared:SSL:1m
+nginx_ssl_session_timeout: 10m
+nginx_ssl_ciphers: '{{ nginx_default_ssl_ciphers }}'
+nginx_log_syslog: true
+nginx_redirect_http_https: false