Add possibility to set securityContext for Kafka and Zookeeper containers

[sturman]

What changes were proposed in this pull request?

Added possibility to include securityContext for Zookeeper and Kafka containers

How was this patch tested?

• set

  cp-kafka:
    securityContext:
      runAsUser: 0
      runAsGroup: 0

  and

  cp-zookeeper:
    securityContext:
      runAsUser: 0
      runAsGroup: 0

  in values.yaml

• helm template kafka ./ > some.yaml

• find securityContext in some.yaml

• verified securityContext is set according to values in values.yaml

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[sturman]

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