kubernetes-druid-discovery-extension: stress-test overlord/coordinator leadership changes #11205
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Fixes #10542
#10669 introduced the travis build that does data ingestion and querying on a zookeeper-less cluster using kubernetes druid extention. this patch adds another build that stress tests the leader election by repeatedly restarting coordinator/overlor and forcing leadership changes when kubernetes druid extension is used. this is a follow-up on #10680 .
In the process kubernetes java client dependency version is also updated to pull changes related to leader election improvements so that graceful coordinator/overlord shutdown immediately gives up leadership.
This PR has: