syslog: change it to unix domain socket

docker is using a extra udp port for every container. when there is
a lot of containers, a lot of random udp ports get used up. this causes
problems when installing apps that require contiguous port ranges

syslog/service.js

@@ -5,8 +5,7 @@
 const server = require('./server.js');
 
 const options = {
-    logFolder: process.argv[2] || '/home/yellowtent/platformdata/logs',
-    port: 2514
+    logFolder: '/home/yellowtent/platformdata/logs',
 };
 
 async function main() {