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Description of problem:

NetworkManager logs the following on ipv6 disabled system.

~~~
failure changing link: failure 97 (Address family not supported by protocol)
failed to disable userspace IPv6LL address handling (unspecified)
~~~


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

NetworkManager-1.10.2-16.el7_5


How reproducible:
Always


Steps to Reproduce:
- Sample
1. Set a kernel parameter, ipv6.disable=1

2. nmcli con add con-name ens8 type ethernet ifname ens8 ipv4.addresses 172.16.1.10/24 ipv4.method manual ipv6.method ignore

3. nmcli con down ens8; nmcli con up ens8

4. Get the following message.

~~~
NetworkManager[3214]: <warn>  [1539139755.3003] platform-linux: do-change-link[3]: failure changing link: failure 97 (Address family not supported by protocol)
NetworkManager[3214]: <warn>  [1539139755.3003] device (ens8): failed to enable userspace IPv6LL address handling (unspecified)
~~~


Actual results:

See the message


Expected results:

Do not see the message


Additional info:

Fixed upstream:

https://cgit.freedesktop.org/NetworkManager/NetworkManager/commit/?id=20d905e59050abb8dfe69861bd1a8803ba8ea6d7

Tested, messages have correct log level now, Sanity Only since we are not able to test with ipv6.disable=1 in our CI.

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, 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-2019:2302