v0.4.0-rc.1

Changelog

4720595 Add canary paused / failed metrics (#56)
f0fff1b Add eds_controller_leader gauge to identify leader from /metrics and /ksmetrics (#50)
1b59ab0 Add extendeddaemonset-check helper (#53)
d72a1bc Merge pull request #49 from DataDog/v0.3
b98cd7a Update validate.go (#54)
a8d38a8 Validate the canary properly in e2e tests (#57)
738e5f9 add parameter to configure max restarts for canary pause (#51)
50d7af1 canary pod label (#52)
c951eae fix flaky e2e (#55)
fc093ee release v0.4.0-rc.1