Fix error while --set reloader.extraEnv.elk_port=<numeric value>

[a-b-v]

If you are trying to set numeric values to extraEnv, like
--set fluentd.extraEnv.elk_host="ELK_HOST" --set fluentd.extraEnv.elk_port="9200" --set fluentd.extraEnv.elk_user="user",
helm gives an error.

[vmwclabot]

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