Make test networks not be VPNs

Make this change for below reasons:
- This API is intended to be used for testing.
- This change correct because almost all the tests that use this
  API are not doing so to create VPNs.
- It makes it easier to write tests for IKEv2 VPNs because without
  this change, a VPN that is restricted to test networks would pick
  itself as the underlying network(since it does not have
  NET_CAPABILITY_NOT_VPN).

Test: treehugger
Change-Id: I91582f398e426c0efb2dec28943df5f572e1c8da
1 file changed