Remove get_resource_or_fake method in VPN panel

api/vpn.py now expands related resources now.
get_resource_or_fake method is no longer required.

Closes-Bug: #1292998
Change-Id: I45d049f7ccc3a4be7a6bfb08cbd8de650d4344de
Merge "Remove get_resource_or_fake method in VPN panel"