I tested the packages in trusty, xenial, zesty and artful. The Docker plugin runs well and gathers the expected information for Docker:

===================
Trusty

root@trustysosreport:/tmp/sosreport-trustysosreport-20180115193757# ls  sos_commands/docker/
docker_images  docker_inspect_c800e07175bf  docker_network_ls  docker_ps_-a   docker_stats_--no-stream  journalctl_--no-pager_--unit_docker
docker_info    docker_inspect_efc145e48b1e  docker_ps          docker_ps_-as  docker_version            ls_-alhR_.etc.docker

root@trustysosreport:/tmp/sosreport-trustysosreport-20180115193757# dpkg -l | grep -i sosreport
ii  sosreport                       3.5-1~ubuntu14.04.1                        amd64        Set of tools to gather troubleshooting data from a system

root@trustysosreport:/tmp/sosreport-trustysosreport-20180115193757# lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 14.04.5 LTS
Release:	14.04
Codename:	trusty

===================
Xenial

root@xenialsosreport:/tmp/sosreport-xenialsosreport-20180115193800# ls sos_commands/docker/
docker_images  docker_inspect_3f8a4339aadd  docker_network_inspect_bridge  docker_network_inspect_none  docker_ps     docker_ps_-as             docker_version                       ls_-alhR_.etc.docker
docker_info    docker_inspect_60b785b1981b  docker_network_inspect_host    docker_network_ls            docker_ps_-a  docker_stats_--no-stream  journalctl_--no-pager_--unit_docker

root@xenialsosreport:/tmp/sosreport-xenialsosreport-20180115193800# dpkg -l | grep -i sosreport
ii  sosreport                     3.5-1~ubuntu16.04.1                        amd64        Set of tools to gather troubleshooting data from a system

root@xenialsosreport:/tmp/sosreport-xenialsosreport-20180115193800# lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 16.04.3 LTS
Release:	16.04
Codename:	xenial

===================
Zesty

root@zestysosreport:/tmp/sosreport-zestysosreport-20180115193803# ls  sos_commands/docker/
docker_images  docker_inspect_3f8a4339aadd  docker_network_inspect_bridge  docker_network_inspect_none  docker_ps     docker_ps_-as             docker_version                       ls_-alhR_.etc.docker
docker_info    docker_inspect_f35ad9f7545c  docker_network_inspect_host    docker_network_ls            docker_ps_-a  docker_stats_--no-stream  journalctl_--no-pager_--unit_docker

root@zestysosreport:/tmp/sosreport-zestysosreport-20180115193803# dpkg -l | grep -i sosreport
ii  sosreport                     3.5-1~ubuntu17.04.1                     amd64        Set of tools to gather troubleshooting data from a system

root@zestysosreport:/tmp/sosreport-zestysosreport-20180115193803# lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 17.04
Release:	17.04
Codename:	zesty

===================
Artful

root@artfulsosreport:/tmp/sosreport-artfulsosreport-20180115193802# ls sos_commands/docker/
docker_images  docker_inspect_3f8a4339aadd  docker_network_inspect_bridge  docker_network_inspect_none  docker_ps     docker_ps_-as             docker_version                       ls_-alhR_.etc.docker
docker_info    docker_inspect_f98581a186af  docker_network_inspect_host    docker_network_ls            docker_ps_-a  docker_stats_--no-stream  journalctl_--no-pager_--unit_docker

root@artfulsosreport:/tmp/sosreport-artfulsosreport-20180115193802# dpkg -l | grep -i sosreport
ii  sosreport                     3.5-1~ubuntu17.10.1               amd64        Set of tools to gather troubleshooting data from a system

root@artfulsosreport:/tmp/sosreport-artfulsosreport-20180115193802# lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 17.10
Release:	17.10
Codename:	artful