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Description of problem:

ntp2chrony tool ignores restrict line that contains expanded ipv6 netmasks.

Version-Release number of selected component (if applicable):

chrony-3.5-2.el8.x86_64

How reproducible:

Steps to Reproduce:
1.
Add a restrict line like the following:
~~~
restrict xxxx:xxxx:xxxx:xxxx:: mask ffff:ffff:ffff:fff0:: nomodify notrap nopeer noquery
~~~

2. run ntp2chrony
3.

Actual results:

The generated /etc/chrony.conf shows that it was ignored in the conversion:

~~~
# The following directives were ignored in the conversion:
# restrict xxxx:xxxx:xxxx:xxxx:: mask ffff:ffff:ffff:fff0:: nomodify notrap nopeer noquery
~~~

Expected results:

The restrict line for IPv6 is converted.

Additional info:

It is a limitation of the python ipaddress library that ntp2chrony is using.

The description of IPv6Network says:
~~~
https://docs.python.org/3/library/ipaddress.html

    Note that currently expanded netmasks are not supported. That means
    2001:db00::0/24 is a valid argument while 2001:db00::0/ffff:ff00:: is
    not.
~~~

Upstream fix:
https://github.com/mlichvar/ntp2chrony/commit/3f97b85180ffb428d52a7b92e1abe47da6a1a7a5

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 (chrony 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/RHBA-2022:7784