Resolve syslog obsolete warnings (#478)

Standard output type syslog is obsolete, automatically updating to
journal. Please update your unit file, and consider removing the setting
altogether.

As discussed here =>
mattbrictson/tomo-plugin-sidekiq#193

---------

Co-authored-by: Matt Brictson <matt@mattbrictson.com>

docs/plugins/puma.md

@@ -9,7 +9,7 @@ Tomo's implementation installs puma as a _user-level_ service using `systemctl -
 $ loginctl enable-linger <DEPLOY_USER>
 ```
 
-Stdout and stderr of the puma process will be routed to syslog, as is the convention for systemd services. For Rails, it is recommended that you set `RAILS_LOG_TO_STDOUT=1` so that all Rails logs are handled this way (`tomo init` configures this by default).
+Stdout and stderr of the puma process will be routed to the systemd journal. For Rails, it is recommended that you set `RAILS_LOG_TO_STDOUT=1` so that all Rails logs are handled this way (`tomo init` configures this by default).
 
 The tomo puma plugin assumes that your puma server will listen on a single TCP port for HTTP (not HTTPS) traffic. In other words, HTTPS termination will be handled by e.g. Nginx or a separate load balancer.
 

lib/tomo/plugin/puma/systemd/service.erb

@@ -8,9 +8,7 @@ ConditionPathExists=<%= paths.current %>
 ExecStart=/bin/bash -lc 'exec bundle exec --keep-file-descriptors puma -C config/puma.rb -b tcp://<%= settings[:puma_host] %>:<%= settings[:puma_port] %>'
 KillMode=mixed
 Restart=always
-StandardError=syslog
 StandardInput=null
-StandardOutput=syslog
 SyslogIdentifier=%n
 TimeoutStopSec=5