Added size limit to prevent logfiles from getting too big

Also added "nodateext" to prevent logrotate from using date extension format on rotated logfiles

system/logrotate.d/kamailio.conf

@@ -1,5 +1,7 @@
 /var/log/kamailio/kamailio.log {
     daily
+    size 500M
+    nodateext
     missingok
     notifempty
     rotate 31