Skip unreachable route when estimating VPN destinations

Bug: 122652441
Test: atest com.android.server.connectivity.VpnTest
Test: Establish a IPv4 VPN with minimal routes and check
(dumpsys connectivity) the VPN network does not have INTERNET
capability.

Change-Id: Ic7f19ebb7b7f78a6ffb2a8ec3fc3eca5e5421f57
1 file changed
tree: 1ef274ad330f83f7ac0d99e174f423529bb40235
  1. core/
  2. services/
  3. tests/