CNAME regression fix: CVE-2018-14629 for 4.8

Andrew Bartlettrequested to merge
samba-team/devel/samba:abartlet-CVE-2018-14629-v4-8 into v4-8-stable

A merge request to track the patch for and trigger CI of the Samba 4.8 regression fix for the original fix for CVE-2018-14629 released recently.

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