Single-member teams on GitHub

Similar to the single-author issue with Rubygems, we also have a number
of single-member GitHub teams. This is less serious, since owners can
always assign new people, but for consistency I thought I'd bring it
up. Here's the list:

Azure (dlobatog)
Bootdisk (domcleal)
Cockpit (dlobatog)
Expire hosts (timogoebel)
Hooks (domcleal)
Setup (domcleal)
Default Hostgroup (me)
Extra Validator (timogoebel)
Omaha (timogoebel)
Scaleway (timogeobel)

What's the view here? Do we think it's a good idea to apply the same
plugin principles here, and add another maintiner (even just a dormant
one) to these groups? Owners can always retro-actively do this, but
perhaps it's better for consistency?

Greg