Merge branch '5923-cname-record-appear-on-another-domain-when-they-contain-the-machine-cn' into '1.4-dev'

Resolve "cname record appear on another domain when they contain the machine cn"

See merge request fusiondirectory/fd-plugins!520

(cherry picked from commit 678e867f)

d58b2156 🚑 fix(dns) Use more restritive regexp for record filter