Update startap.net.xml for GLIF2013 config

Gerben requested these VLANs to be limited to prevent layer 2 loops:
GLORIAD (StarLight-GLORIAD-SingAREN): VLANs 1779, 1780, 1781, 1784
JGN-X (StarLight-JGN-X-SingAREN): VLANs 1782, 1783