Github user prabhjyotsingh commented on the issue:
https://github.com/apache/zeppelin/pull/2853
@felixcheung it doesn't happen always but at times before could
Zeppelin-server start test case starts executing, and by making `spawn="false"`
maven waits for the command (./bin/zeppelin-daemon.sh start) to complete, and
`CI=true` make zeppelin-daemon to wait for localhost:8080 to be active.---
