Audit HMAC values on AuthConfig (#4077)

* Add audit hmac values to AuthConfigInput and AuthConfigOutput, fix docs

* docs: Add ttl params to auth enable endpoint

* Rewording of go string to simply string

* Add audit hmac keys as CLI flags on auth/secrets enable

* Fix copypasta mistake

* Add audit hmac keys to auth and secrets list

* Only set config values if they exist

* Fix http sys/auth tests

* More auth plugin_name test fixes

* Pass API values into MountEntry's config when creating auth/secrets mount

* Update usage wording