policy: get the DHCPv6 hostname from the FQDN option

There isn't any 'host-name' option for DHCPv6. Read instead the
'fqdn-fqdn' option that carries the FQDN assigned by the server to the
client.
22 jobs for bg/dhcpv6-hostname-rh1858344 in 37 minutes and 55 seconds (queued for 3 seconds)
latest
Status Job ID Name Coverage
  Test
passed #3970005
checkpatch

00:01:07

manual #3970012
allowed to fail manual
t_centos:7.5.1804
manual #3970013
allowed to fail manual
t_centos:7.6.1810
manual #3970014
allowed to fail manual
t_centos:7.7.1908
manual #3970015
allowed to fail manual
t_centos:7.8.2003
manual #3970016
allowed to fail manual
t_centos:8.1.1911
manual #3970022
allowed to fail manual
t_debian:10
manual #3970021
allowed to fail manual
t_debian:9
manual #3970024
allowed to fail manual
t_debian:sid
manual #3970023
allowed to fail manual
t_debian:testing
manual #3970006
allowed to fail manual
t_fedora:28
manual #3970007
allowed to fail manual
t_fedora:29
manual #3970008
allowed to fail manual
t_fedora:30
passed #3970009
t_fedora:31

00:37:55

manual #3970010
allowed to fail manual
t_fedora:32
manual #3970011
allowed to fail manual
t_fedora:rawhide
manual #3970017
allowed to fail manual
t_ubuntu:16.04
manual #3970018
allowed to fail manual
t_ubuntu:18.04
manual #3970020
allowed to fail manual
t_ubuntu:devel
manual #3970019
allowed to fail manual
t_ubuntu:rolling
 
  External
failed https://desktopqe-jenkins.rhev-ci-vms.eng.rdu2.redhat.com/job/beaker-NetworkManager-gitlab-trigger-code-upstream/1708/

failed https://desktopqe-jenkins.rhev-ci-vms.eng.rdu2.redhat.com/job/beaker-NetworkManager-gitlab-trigger-code-upstream/1708/

05:34:47