Add RequiresFeature annotations for IKEv2 VPN profiles

This change adds the @RequiresFeature annotation to Ikev2VpnProfile
Builder methods, and checks before provisioning VPN profiles.

Bug: 156681625
Test: New tests added, passing.
Change-Id: I125d8fbe5d67fb877ad7d0636c007cb3e1a9f59b
1 file changed
tree: ddd1f0c135f03f8ba80c21784f82160152251ca7
  1. core/
  2. services/
  3. tests/