ratelimit: revert `revert rate limit failure mode config` and add tests#4303

Merged

ggreenway merged 3 commits intoenvoyproxy:masterfrom ramaraochavali:fix/ratelimit_revert

Aug 31, 2018

+255-36

Commits on Aug 30, 2018

revert revert ratelimit and add tests
ramaraochavali
committed

Commits on Aug 31, 2018