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Description of problem:

When server got IPv6 address assigned from IPv6-RA/autoconf, the reverse hostname lookup via DNS will fallback to `myhostname` which generate `localhost`

Please checking openshift bug https://bugzilla.redhat.com/show_bug.cgi?id=1959842 for detail.

Version-Release number of selected component (if applicable):
NetworkManager-1.32.0-0.4.el8

How reproducible:


Steps to Reproduce:
 * Please contact openshift team in https://bugzilla.redhat.com/show_bug.cgi?id=1959842

Actual results:

`localhost` been used as hostname of server.

Expected results:

Server should only use DNS server returned name instead of `myhostname` module.

Additional info:

*** Bug 1907049 has been marked as a duplicate of this bug. ***

NMCI test added:
https://gitlab.freedesktop.org/NetworkManager/NetworkManager-ci/-/merge_requests/795

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (Moderate: NetworkManager security, bug fix, and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2021:4361