Convert GitHub team maintainers to members

[spiffxp]

Now that we automate the management of GitHub teams (#336), it is confusing when people try to use GitHub's UI to manually manage teams, only to have their changes reverted (eg: #559)

While we wait for docs (kubernetes/community#3102) I believe we should move everyone to being a regular team member, and encourage use of PR's against this repo for GitHub team management

That said, one fun little wrinkle I discovered in #522 is that GitHub Owners need to remain team maintainers

/kind cleanup
/priority important-soon

[spiffxp]

Notified kubernetes-dev@

[nikhita]

I'll update the docs and config.

/assign

[rlenferink]

I'll update the docs and config.

/assign

@nikhita While we're at it with PR #546, should I update the other sig-docs teams as well to 'convert' maintainers to members?

[nikhita]

@nikhita While we're at it with PR #546, should I update the other sig-docs teams as well to 'convert' maintainers to members?

Sure, that would be good. :)

[nikhita]

Created #566 for the config part.

I'll add the docs later this week.

[nikhita]

Created kubernetes/community#3368 for the docs.

[nikhita]

The config part has now merged: #566. All existing (non-admin) team maintainers have been converted to members and a test has been added to check that non-admins are not listed as maintainers.

Also notified k-dev that this is done: https://groups.google.com/d/msg/kubernetes-dev/WtvHtt2lR1w/TMiaTjESCAAJ