Add logrotate file

Signed-off-by: Dimitris Aragiorgis <dimara@grnet.gr>

nfdhcpd.logrotate

+/var/log/nfdhcpd/nfdhcpd.log {
+  daily
+  rotate 5
+  missingok
+  notifempty
+  create 644 nobody nogroup
+}
+