Merge branch '5678-the-reverse-for-slave-should-be-written-in-is-own-file-not-included-in-the-first-slave-domain' into 'argonaut-1.3-dev'

Resolve "the reverse for slave should be written in is own file not included in the first slave domain"

Closes #5678

See merge request !18

(cherry picked from commit 4fcbe6fb)

3f160728 🚑 fix(ldap2zone): Put slave reverse zone in its own file