Add basic logic for profile-based VPNs

This change adds stubs for the Platform built-in VPNs, along with
implementing some basic permissions checks.

Bug: 144246837
Test: FrameworksNetTests passing, new tests added
Change-Id: I68d2293fc1468544f0d9f64d02ea7e1c80c8d18c
3 files changed
tree: 6e91ce652b3b3611a33d6d12a1bee9cbd924571a
  1. core/
  2. services/
  3. tests/