How to prevent console and ssh logins until a service has started in RHEL7

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Issue

We have a custom service that starts a configuration script. We don't want the RHEL7 system to allow any logins (including ssh or local black & white ttys) until the script has finished. How?
How to disallow login in RHEL 7 until a SysV init script has finished?

Environment

Red Hat Enterprise Linux 7

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