Reapply "Send ICMPv6 ping to support IPv6-only network"

This reverts commit 98219a4e8af9c3755124508fd6db4b9a4f92fc8d.

Moved the revert past "Only run APF tests on physical devices".
This broke on cuttlefish, as CF does not support IPv6.

Test: TH
Change-Id: I04d1adb4538e6c413a1325432e1c014ca78b41e3
1 file changed