src/usr/lib/xymon/client/ext/dnsq: use rdstring instead of rdatastr

Lars Kollstedtrequested to merge
larskoll-guest/hobbit-plugins:kollstedt/fix_dnsq_rdstring_instead_rdatastr into master

Fix deprecation warning in dnsq status message. Should work with Net::DNS >= 1.01.

Replace !4 (closed) since it shows necessary rebase, but rebase doesn't work.

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