Refactor the things that are common between bird and frr build types -- no-op for the build/ output

overlays/_common/common/root/lab-build/perms

@@ -0,0 +1,7 @@
+#!/bin/bash
+
+echo " * Fixing permissions"
+chown -R root. /root/
+chown -R ipng. /home/ipng/
+
+[ -r /etc/rc.local ] && chmod 755 /etc/rc.local