Fix the preplogsdir script to work after a restart of the container

conf/init/preplogsdir.sh

@@ -3,6 +3,8 @@
 echo 'Linking config files to logs directory'
 for svc in `ls /etc/service/`
 do
-  mkdir -p /var/log/$svc
-  ln -s /svlogd_config /var/log/$svc/config
+  if [ ! -d /var/log/$svc ]; then
+    mkdir -p /var/log/$svc
+    ln -s /svlogd_config /var/log/$svc/config
+  fi
 done