Various improvements to the systemd unit

- Use the Journal to log stdout/stderr
- Drop DefaultInstance, it doesn't do anything in non-template units
- Add sysusers config to manage the direwolf user automatically

systemd/direwolf.logrotate

@@ -1,15 +1,3 @@
-/var/log/direwolf/stdout /var/log/direwolf/stderr {
-    missingok
-    rotate 30
-    daily
-    copytruncate
-    notifempty
-    compress
-    delaycompress
-    dateext
-    dateyesterday
- }
-
 /var/log/direwolf/*.log {
     missingok
     daily

systemd/direwolf.service

@@ -12,16 +12,13 @@ User=direwolf
 # doing so.  Then run systemctl daemon-reload so systemd uses your updated
 # copy of this service file.
 #ExecStartPre=/some/script.sh
-ExecStart=/bin/bash -ce "exec /usr/bin/direwolf $DIREWOLF_ARGS >>/var/log/direwolf/stdout 2>>/var/log/direwolf/stderr"
+ExecStart=/usr/bin/direwolf $DIREWOLF_ARGS
 Restart=always
-StandardOutput=null
-StandardError=null
 ProtectSystem=strict
 ProtectHome=true
 ReadWritePaths=/var/log/direwolf
 
 [Install]
 WantedBy=multi-user.target
-DefaultInstance=1
 
 # alternate version:  https://www.f4fxl.org/start-direwolf-at-boot-the-systemd-way/

systemd/direwolf.sysusers

@@ -0,0 +1,4 @@
+#Type Name     ID      GECOS                                 Home directory      Shell
+u     direwolf -:audio 'Direwolf Sound Card-based AX.25 TNC' /usr/share/direwolf -
+m     direwolf audio
+m     direwolf dialout