pass options through env_vars if no control over init files

The logic here is that if init_style is non, then we have no control
over the init files themselves *except* through the environment
file.

Typically, the way this works is there is a ARGS environment variable
that gets sucked into the systemd unit file (or the sysv init file).

manifests/daemon.pp

@@ -214,15 +214,23 @@
     'none': {}
   }
 
-  unless $env_vars.empty {
+  if $init_style == 'none' and $install_method == 'package' {
+    $env_vars_merged = $env_vars + {
+      'ARGS' => $options,
+    }
+  } else {
+    $env_vars_merged = $env_vars
+  }
+
+  unless $env_vars_merged.empty {
     file { "${env_file_path}/${name}":
       mode    => '0644',
       owner   => 'root',
       group   => '0', # Darwin uses wheel
       content => epp(
         'prometheus/daemon.env.epp',
         {
-          'env_vars' => $env_vars,
+          'env_vars' => $env_vars_merged,
         }
       ),
       notify  => $notify_service,