added get_related_networks and site to the vlan model
added get_related_networks and site to the vlan model

drkitty/cyder,drkitty/cyder,OSU-Net/cyder,OSU-Net/cyder,akeym/cyder,zeeman/cyder,drkitty/cyder,zeeman/cyder,murrown/cyder,OSU-Net/cyder,zeeman/cyder,zeeman/cyder,akeym/cyder,OSU-Net/cyder,murrown/cyder,akeym/cyder,murrown/cyder,akeym/cyder,murrown/cyder,drkitty/cyder