Missing / in default ZK_LOG_DIR

[rocketraman]

No description provided.

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[k8s-reviewable]

This change is 

[k8s-github-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

The following people have approved this PR: rocketraman

Needs approval from an approver in each of these OWNERS Files:

• statefulsets/zookeeper/OWNERS

We suggest the following people:
cc @bprashanth
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[rocketraman]

I signed it!

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