VAULT-571 Matching documented behavior and consul
Consul's helm template defaults most of the enabled to the special value
`"-"`, which means to inherit from global. This is what is implied
should happen in Vault as well according to the documentation for the
helm chart:
> [global.enabled] The master enabled/disabled configuration. If this is
> true, most components will be installed by default. If this is false,
> no components will be installed by default and manually opting-in is
> required, such as by setting server.enabled to true.
(https://www.vaultproject.io/docs/platform/k8s/helm/configuration#enabled)
We also simplified the chart logic using a few template helpers.
Co-authored-by: Theron Voran <tvoran@users.noreply.github.com>
