jetstack/navigator

`CassandraCluster.Spec.Sysctl` does nothing

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In the Cassandra controller I never added the init containers necessary to perform the sysctls.
And so far everything has been working.
So I think we should remove sysctls and document an alternative.

Seems like it should be something configured when provisioning the kubernetes node.
And then there should be a way of scheduling elasticsearch / cassandra pods to only the nodes where those sysctls have been configured.

Part of: #194

/kind bug