We discussed at standup that we prioritize the security of the default
configuration over backwards compatibility. This new default does that.
The list of groups is primarily informed by:
<https://wiki.debian.org/SystemGroups#Other_System_Groups>
<https://docs.fedoraproject.org/en-US/packaging-guidelines/UsersAndGroups/#_list_of_statically_allocated_uidgid_and_corresponding_package>
Arvados-DCO-1.1-Signed-off-by: Brett Smith <brett.smith@curii.com>