1a4d423328
This adds support for enforcing exit node LAN access, DNS and subnet routes. Adding new preference policies was getting repetitive, so this turns some of the boilerplate into a table. Updates tailscale/corp#15585 Updates ENG-2240 Change-Id: Iabd3c42b0ae120b3145fac066c5caa7fc4d67824 Signed-off-by: Adrian Dewhurst <adrian@tailscale.com>