Backport: Fix 'index out of range' bug in Packetbeat DNS protocol plugin (#2875) #2909
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When converting resource records into MapStrs the code can run into an index out of range exception when processing OPT psuedo resource records. The code reduces the size of a slice by creating a new, smaller slice and copies the existing data to the smaller slice. But the code did not account for the fact that the length of the slice was smaller when indexing. Fixes elastic#2872 (cherry picked from commit cbde106)
(cherry picked from commit 7c2fe09)
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Backport of #2875 to 5.0
Cherry picked from: cbde106, 7c2fe09