start one worker process per core

Many people are confused by this default setting. The default of one
core is often a bottleneck. I would like to switch the default to the
amount of cores. The auto option is also recommended upstream:
https://www.nginx.com/blog/tuning-nginx/

manifests/init.pp

@@ -135,7 +135,7 @@
   $types_hash_max_size                                       = '1024',
   Integer $worker_connections                                = 1024,
   Enum['on', 'off'] $ssl_prefer_server_ciphers               = 'on',
-  Variant[Integer, Enum['auto']] $worker_processes           = 1,
+  Variant[Integer, Enum['auto']] $worker_processes           = 'auto',
   Integer $worker_rlimit_nofile                              = 1024,
   $ssl_protocols                                             = 'TLSv1 TLSv1.1 TLSv1.2',
   $ssl_ciphers                                               = 'ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA:ECDHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-RSA-AES256-SHA256:DHE-RSA-AES256-SHA:ECDHE-ECDSA-DES-CBC3-SHA:ECDHE-RSA-DES-CBC3-SHA:EDH-RSA-DES-CBC3-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:DES-CBC3-SHA:!DSS', # lint:ignore:140chars