Adding InfluxDB Helm chart

[zakaria2905]

Adding InfluxDB in Chart.yaml file
Adding enable configuration in values.yaml file
Adding doc link in README.md file

We chose the influxdb chart of bitnami because it release activity is higher:
https://artifacthub.io/packages/search?ts_query_web=influxdb&sort=relevance&page=1

[banzo]

Seems there is a linting issue:

>> Building chart...
>>> helm lint /root/project/fadi
coalesce.go:196: warning: cannot overwrite table with non table for service (map[annotations:map[] clusterIP: loadBalancerIP: loadBalancerSourceRanges:[] nodePorts:map[http: rpc:] port:8086 rpcPort:8088 sessionAffinity: sessionAffinityConfig:map[] type:ClusterIP])
coalesce.go:196: warning: cannot overwrite table with non table for service (map[annotations:map[] clusterIP: loadBalancerIP: loadBalancerSourceRanges:[] nodePorts:map[http: rpc:] port:8086 rpcPort:8088 sessionAffinity: sessionAffinityConfig:map[] type:ClusterIP])
==> Linting /root/project/fadi
[ERROR] templates/: template: fadi/charts/influxdb/templates/influxdb/service.yaml:11:19: executing "fadi/charts/influxdb/templates/influxdb/service.yaml" at <.Values.influxdb.service.annotations>: can't evaluate field annotations in type interface {}

Error: 1 chart(s) linted, 1 chart(s) failed

[banzo]

Some preliminary review comments:

• keep the enabled flags as they were before in the values.yaml file
• influxdb should be disabled by default
• PR description should include a justification of the Bitnami chart selection (why not https://github.com/influxdata/helm-charts/tree/master/charts for example)
• add influxdb to the README services table (mention this is including influxdb and not influxdbv2)
• create issue so we keep track that we will probably want to add support for influxdb v2