Don't check that requestRouteToHost works if we have no IPv4.

requestRouteToHost only supports IPv4, but it doesn't return
failure if the network doesn't have an IPv4 address. Therefore,
don't check that it's working if the network doesn't have IPv4.

Bug: 23827074
Change-Id: I05459ea0fca8b2b6d97c3c2330f11b08e096618c
1 file changed