Detangle boot error handling, step 2

We used to have a weird situation where an error inside a boot step
would cause us to go through error logging twice. The exception would
get caught in run_step/3, then go through boot_error() etc, and
basic_boot_error/3 would exit again, leading to more stuff being
logged as an application start failure. So to fix that, let's
exit with a special atom which prevents further logging. Also
rename functions to be a bit more meaningful.

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