Add ability to populate -inject-auth-method-host from a secret

[barrymars]

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Feature Description

It would be really useful to be able to configure -inject-auth-method-host of the server-acl-init-job, by specifying a secret to load an environment variable from.

This helps allow the same values to be applied to multiple clusters as this bit of cluster specific config would be external to the values and referenced via a common name

Contributions

https://github.com/hashicorp/consul-k8s/pull/1130