Expect no error for startLegacyVpn with IPv6.

findIPv4DefaultRoute() is removed from Vpn, so
IllegalStateException is no longer thrown for IPv6 only
networks.

The test testStartLegacyVpnIpv6 is now not testing anything new
and so it is removed. Note that other tests that will be calling
startLegacyVpn() ensure coverage is not lost.

Bug: 161776767
Test: atest FrameworksNetTests
Change-Id: I6ac9d7c196b7bc4c44fc2ad32baa25b106640ef4
1 file changed