Sreeram Ramachandran d7e71641f6 Block address families by default in VpnService.
If a VpnService only configures IPv4 addresses, routes and DNS servers, block
IPv6 by default, and vice versa. Also add an API to unblock a family without
needing to add an address, route or DNS server.

New API with stub implementation to be filled out later.

Bug: 15972465
Change-Id: I70d4d5c30ee71802610f6e16f100db6cbccef42c
2014-07-10 17:54:03 +00:00
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