When executing install-zookeeper-operator.sh exceptions happen:

$ ./install-zookeeper-operator.sh
namespace/zookeeper-operator created
error: unable to read URL "https://raw.githubusercontent.com/pravega/zookeeper-operator/raw/v0.2.15/config/crd/bases/zookeeper.pravega.io_zookeeperclusters.yaml", server reported 404 Not Found, status code=404
error: error validating "/dev/fd/63": error validating data: [apiVersion not set, kind not set]; if you choose to ignore these errors, turn validation off with --validate=false
error: error validating "/dev/fd/63": error validating data: [apiVersion not set, kind not set]; if you choose to ignore these errors, turn validation off with --validate=false

This PR fixes exceptions above.

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