CNAME values to be allowed underscores

Version 1.49

Feature
Finished

Bug with the allow_dns_underscore=1 where the CNAME value didn't get allowed as the "VALUE" is checked for syntax for resolvability, part of which is a "valid domain" syntax check, which didn't allow underscores. Changed the check to allow underscores, but allow_dns_underscore=1 is still required. This change only applies to a CNAME value. The "name" (left side) would have already allowed for underscores.

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