Simplify wwctl server

- Always run in the foreground
- Always log to stdout/err (unless syslog is requested)
- Update systemd to reload with a direct signal
- Omit any pidfile for "warewulfd"

Signed-off-by: Jonathon Anderson <janderson@ciq.com>

docs/man/man5/warewulf.conf.5

@@ -112,11 +112,7 @@ Default: true
 .TP
 \fBsyslog\fP
 
-When true, Warewulf server logs are written to syslog, rather than a
-local file.
-
-When false, Warewulf server logs are written to
-`/var/log/warewulfd.log'.
+When true, Warewulf server logs are written to syslog.
 
 Default: false
 .IP