Add travis_retry to mitigate impact of GDTCCT flakes (#4119)
Add travis_retry to mitigate impact of GDTCCT flakes (#4119)


firebase/firebase-ios-sdk,firebase/firebase-ios-sdk,firebase/firebase-ios-sdk,firebase/firebase-ios-sdk,firebase/firebase-ios-sdk,firebase/firebase-ios-sdk,firebase/firebase-ios-sdk