xml: T4698: validating a range must be explicitly enabled in the validator

This extends commit 28573ffe4f ("xml: T4698: drop validator name="range" and
replace it with numeric"). The first version allowed both a range and discrete
numbers to be validated by the numeric validator.

This had a flaw as both 22 and 22-30 were valid at the same time. The generic
"port-number.xml.i" building block only allows a discrete number. Now if a user
set port 22-30 for e.g. SSH the daemon did no longer start. This is why range
validation must be explicitly enabled.

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