better form checking for SRV records

Version 1.38

Bugfix
Finished

Ensure proper value checking for SRV records. Reference: http://en.wikipedia.org/wiki/SRV_record This change will ensure values are valid: http://www.directadmin.com/features.php?id=1167 Saves us from having to learn all dns syntax. We'll let named tell us if it's valid.

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