[freeipa PR#5711][opened] [Backport][ipa-4-9] ipaserver/install/dns: handle SERVFAIL when checking reverse zone

[flo-renaud]

   URL: https://github.com/freeipa/freeipa/pull/5711
Author: flo-renaud
 Title: #5711: [Backport][ipa-4-9] ipaserver/install/dns: handle SERVFAIL when checking
reverse zone
Action: opened

PR body:
"""
This PR was opened automatically because PR #5708 was pushed to master and backport to
ipa-4-9 is required.
"""

To pull the PR as Git branch:
git remote add ghfreeipa https://github.com/freeipa/freeipa
git fetch ghfreeipa pull/5711/head:pr5711
git checkout pr5711