Merge branch 'unify-ipv6' into 'master'

docs/reference.md

docs/reference.pdf

plugins/action/tinc_host_conf.py

plugins/inventory/float.py

roles/float-base-auth-server/templates/auth-server.yml.j2

...-base-net-overlay/templates/firewall/11net-overlay-raw.j2

roles/float-base/templates/firewall/10float.j2

roles/float-base/templates/jail.local.j2

roles/float-infra-acme/templates/config.yml.j2

roles/float-infra-dns/templates/bind/named.conf.options

roles/float-infra-dns/templates/dns/infra.yml

roles/float-infra-dns/templates/zonetool.yml

roles/float-infra-sso-server/templates/server.yml.j2

test/float_integration_test/__init__.py