Added support for Kubernetes 1.8 ingressClassName to InfluxDB Helm chart

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I noticed that the InfluxDB Helm chart did not have a variable allowing me to set ingressClassName, an important variable on Kubernetes 1.8 clusters that was simply an annotation in previous Kubernetes versions. For instance, I can set this variable to something like “nginx” to get nginx as my ingress.

I submitted a PR that was quickly merged that will provide that feature, and it seems to be working fine.