Compare the behavior of accepting IPv6 link-local DNS Added a feature flag to turn on/off the behavior of accepting IPv6 link local DNS. It's better to do A/B testing based the exact legacy code, namely, DNS server string array contains an IPv6 link-local address string without scope id instead of skipping it. Bug: 163492391 Test: atest NetworkStackIntegrationTests (cherry picked from https://android-review.googlesource.com/q/commit:3a354353e1e5219dc7400f2de7b64f0318728d7c) Merged-In: Ic789e39fd419458adba968263aa3bd032cbe31fa Change-Id: Ic789e39fd419458adba968263aa3bd032cbe31fa