nmcli: fix setting_types() to properly handle routing_rules as a list type (#11635)
* Fix setting_types() to properly handle routing_rules as a list type
* Add changelog fragment for ipv6.routing-rules bugfix
* Update changelogs/fragments/11630-nmcli-ipv6-routing-rules.yml
* Add PR URL to changelog fragment
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(cherry picked from commit 3c21ac961b)
Co-authored-by: Ted W. <ted.l.wood@gmail.com>
Co-authored-by: Alexei Znamensky <103110+russoz@users.noreply.github.com>