Store active job cache pointer in Zookeeper #2681
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We want to store the active job cache somewhere accessible to services not running on ingestmaster. The team decided to go with zookeeper.
I updated load-job-cache.sh to call a java utility to set the active job cache as doing it in bash was non-trivial as you have to recursively create ZK paths if they do not exist.
Honestly, we may want to consider moving the whole load-job-cache functionality into java as that bash script is pretty hefty. We'd be able to test it and probably read it easier. But for now, I just set the active job cache in ZK.