Title: #416: replica install: relax domain level check for promotion
The purpose of `check_domain_level()` was to have a unified means of checking
whether the domain level in the rest of the domain corresponds to the
installation media which is presented by the user.
Looking back at it I think I chose poor naming and documentation of the check
so it's rather confusing.
If you find a way to make a unified check in both domain levels (=> a single
function call for both DLs that will raise exception when wrong installation
media is presented), that'd be nice. Otherwise feel free to split it back to
what it was previously.
See the full comment at
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